1.20g of methyl alcogol aare dissolved in 16.8g of water. what is the mole fraction of the solute?
Answers
The mole fraction of the solute is 0.5, which means that the solute is methanol.
The mole fraction of the solute, we need to first calculate the number of moles of methanol in the solution. The total number of moles of solute is the sum of the moles of methanol and the moles of water.
The number of moles of methanol can be calculated by using the molecular weight of methanol, which is 32.04 g/mol, and the number of moles of water in the solution. The number of moles of water can be calculated by using the molarity of the solution, which is defined as the number of moles of solute per liter of solution.
The molarity of the solution can be calculated as follows:
molarity = moles solute / liters of solution
molarity = 1.20 g / 16.8 g
molarity = 0.072 mol/L
The number of moles of methanol can be calculated by using the formula:
number of moles of solute = number of moles of water * mole fraction of solute
number of moles of solute = 0.072 mol/L * 0.5
number of moles of solute = 0.36 mol/L
The mole fraction of the solute can be calculated as follows:
mole fraction of solute = moles of solute / total moles
mole fraction of solute = 0.36 mol/L / (0.072 mol/L + 0.36 mol/L)
mole fraction of solute = 0.5
Therefore, the mole fraction of the solute is 0.5, which means that the solute is methanol.
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Related Questions
the rate constant of a chemical reaction increased from 0.100 s−1 to 3.30 s−1 upon raising the temperature from 25.0 ∘c to 49.0 ∘c . Calculate the value of (1/T2−1/T1) where T1 is the initial temperature and T2 is the final temperature.
Answers
We are given;The initial rate constant, k1 = 0.100 s⁻¹The final rate constant, k2 = 3.30 s⁻¹The initial temperature, T1 = 25.0°CThe final temperature, T2 = 49.0°CWe are to calculate the value of (1/T2 − 1/T1) where T1 is the initial temperature and T2 is the final temperature.
We know that the rate constant k of a chemical reaction depends upon temperature and can be expressed by the Arrhenius equation as;k = Ae^(-Ea/RT)ln(k1/k2) = (Ea/R) [(1/T2) - (1/T1)](Ea/R) = ln(k1/k2) / [(1/T2) - (1/T1)]
Substituting the values of k1, k2, T1 and T2 into the above equation;ln(0.1/3.3) = (Ea/8.314) [(1/322) - (1/298)]=> Ea = 115, 787.42 J/mol
Therefore;(1/T2 − 1/T1) = (1/322K − 1/298K)= 0.001596 K^-1
Summary:The value of (1/T2 − 1/T1) where T1 is the initial temperature and T2 is the final temperature is 0.001596 K^-1.
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someone help please its a sience testtt
Answers
The equator of the sun rotates faster than the poles.
How does the rotation of the equator of the sun differ from the rotation of the poles of the sun?The equator of the sun rotates faster than its poles. This is known as differential rotation, and it is due to the fact that the sun is not a solid body, but is composed of gas and plasma. The equatorial regions of the sun rotate faster because they are farther from the center of the sun, where the gravitational pull is stronger, and thus experience less resistance to their motion.
The period of rotation of the equator of the sun is shorter than that of the poles. The equator rotates once every 25.4 days, while the poles rotate once every 36 days.
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which of the following statements correctly describe a resonance hybrid? select all that apply.multiple select question.the true structure of the resonance hybrid is the structure of the most stable contributor.the resonance hybrid is stabilized due to delocalization of electrons.a resonance hybrid rapidly interconverts between the possible resonance forms.equivalent resonance forms contribute equally to the overall structure of the hybrid.a resonance hybrid has a single structure.
Answers
The most stable contributor's structure is the genuine structure of the resonance hybrid. The delocalization of electrons is what stabilizes the resonance hybrid. The potential resonance forms are quickly interconverted by a resonance hybrid.
Equivalent resonance types equally contribute to the hybrid's overall structure. Consider the resonance hybrid structure of a carboxylate group as an example. Different resonance contributors do not always contribute equally to the hybrid structure until they are equivalent to one another in terms of stability, as is the case for the carboxylate group, which has equivalent contributions from A and B as shown in the given figure. One resonance structure will more closely resemble the “actual” (hybrid) structure than another if it is more stable (lower in energy) than the other.
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Which of these is a polar molecule?
1. SH2
2. CO2
3. F2
Answers
When potassium cyanide reacts with acids, a deadly poisonous gas, hydrogen cyanide is formed. Using the following equation (be sure it is balanced) calculate the mass in grams of hydrogen cyanide gas produced from 1.80 grams of KCN reacting completely with excess HCL.
KCN + HCI -> KCl + HCN
Answers
Answer:
The balanced chemical equation for the reaction between potassium cyanide (KCN) and hydrochloric acid (HCl) to form hydrogen cyanide (HCN) and potassium chloride (KCl) is:
KCN + HCl → KCl + HCN
To calculate the mass of HCN produced from 1.80 grams of KCN, we first need to determine the limiting reactant, which is the reactant that is completely consumed in the reaction. Since we are given that KCN is present in a limited amount, we can assume it is the limiting reactant.
The molar mass of KCN is 65.12 g/mol. To convert 1.80 grams of KCN to moles, we divide by the molar mass:
1.80 g KCN × (1 mol KCN/65.12 g KCN) = 0.0276 mol KCN
From the balanced equation, we can see that the mole ratio of KCN to HCN is 1:1. Therefore, the number of moles of HCN produced is also 0.0276 mol.
The molar mass of HCN is 27.03 g/mol. To calculate the mass of HCN produced in grams, we multiply the number of moles by the molar mass:
0.0276 mol HCN × (27.03 g HCN/mol) = 0.746 g HCN
Therefore, 1.80 grams of KCN reacting completely with excess HCl produces 0.746 grams of HCN gas.
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Explanation:
help answer this asap!
Answers
Answer:
B
Explanation:
Molarity measures the strength of a solution. Remember, a solution is made up of two parts: the solvent (which does the dissolving) and the solute (the substance that is dissolved). The more solute there is, the higher the concentrate and therefore the higher the molarity of the solution. Thus B is the answer
What would be the charge on an ion whose neutral atom has an electron configuration of 2.8.7?
A. +1
B. 0
C. +7
D. -1
Answers
Answer:
A
Explanation:
What products are formed when a hydrocarbon combusts?
A. Hydrogen and oxygen
B. Carbon dioxide and water
C. Carbon dioxide and hydrogen
D. Water and hydrogen
Answers
Answer:
b
Explanation:
The products are formed when a hydrocarbon combusts are carbon dioxide and water and the correct option is option B.
Combustion is a chemical reaction that occurs when a fuel combines with an oxidizing agent, typically oxygen, resulting in the release of heat and the formation of products. It is an exothermic reaction, meaning it releases energy in the form of heat and light.
During combustion, the fuel undergoes rapid oxidation, breaking its chemical bonds and forming new bonds with oxygen. Common examples of combustion include burning of wood, gasoline, natural gas, and other hydrocarbon fuels.
The reaction is often accompanied by the production of flames and the release of carbon dioxide and water vapor.
Thus, the ideal selection is option B.
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SpongeBob loves to garden and wants to grow lots of pink flowers for his pal Sandy. He brought a special Flower Power fertilizer to see if it will help plants produce more flowers. He plants two plants of the same size in separate containers with the same amount of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the other plant on a shelf in a closet and waters it with plain water every other day.
What did SpongeBob do wrong in this experiment? Explain.
How could SpongeBob improve his experiment?
Answers
Answer: He had more than one independent variable.
Explanation: It would only be fair, if both plants were in a sunny window, because then, it would be easier to see if the fertilizer actually affected the plants. This is because there is always a chance that the lack of sunlight decreased the number of flowers on the plant, instead of the fertilizer. It is always better to just have one independent variable.
Which type of attraction results from the formation of weak momentary dipoles? A Dispersion (van der Waals) forces B metallic C ionic D molecule-ion
Answers
The type of attraction that results from the formation of weak momentary dipoles is dispersion (van der Waals) forces. These forces occur between nonpolar molecules or atoms and arise due to the temporary shifting of electrons in one atom or molecule, which then induces a temporary shift in electrons in another atom or molecule.
What is a dipole moment?A dipole moment measures the separation of electrical charges in a molecule or compound. It is defined as the product of the magnitude of the charge on each end of the polar bond and the distance between them.
What creates a temporary dipole moment?A temporary dipole moment is created due to the shifting of electrons within a molecule or atom. Electrons are constantly moving and randomly distributed within an atom or molecule. At any given moment, the electrons may be more heavily concentrated on one side of the molecule or atom, creating a temporary dipole moment.
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What is the oxidation state of Carbon in CaC2O4?
Answers
Answer:
The oxidation state of carbon in CaC204 is 3
2 moles of NO, was placed in an empty I dm' bottle and allowed to reach equilibrium according to the equation:
At equilibrium, 1.2 moles of N,O, dissociated. Calculate the value of the equilibrium constant for the reaction at that
temperature.
Answers
2NO(g) ⇌ N2(g) + O2(g)
According to the problem statement, 2 moles of NO were placed in a 1 dm^3 bottle and allowed to reach equilibrium, and at equilibrium, 1.2 moles of NO had dissociated. This means that the initial concentration of NO was:
[NO]initial = 2 mol / 1 dm^3 = 2 M
And the concentration of NO at equilibrium is:
[NO]equilibrium = (2 - 1.2) mol / 1 dm^3 = 0.8 M
Since the stoichiometry of the balanced equation is 2:1:1 for NO, N2, and O2, respectively, the equilibrium concentrations of N2 and O2 will also be 0.6 M.
The equilibrium constant (Kc) can be calculated using the equilibrium concentrations of the reactants and products, raised to the power of their stoichiometric coefficients. Therefore:
Kc = ([N2][O2]) / ([NO]^2)
Substituting the equilibrium concentrations into the equation, we get:
Kc = (0.6 M x 0.6 M) / (0.8 M x 0.8 M)
Kc = 0.5625
Therefore, the value of the equilibrium constant for the reaction at that temperature is 0.5625. Note that the units of Kc depend on the stoichiometry of the balanced equation. Since the stoichiometric coefficients are all 1, the units of Kc in this case are M^-1
Ionization energies of elements _________ down a group and generally __________ across a period.
Answers
Due to the shielding effect of the inner electrons, the valence electrons become less strongly attracted to the atom's nucleus as we move down a group. As a result, ionization energies go lower as you go down a group.
Ionization energy likewise rise as we move across a group because the positive charge in the nucleus rises along with the amount of protons in the nucleus and the attractive force on the valence electrons.
What is Ionization energy ?Ionization energy, often referred to as ionization potential, is the amount of energy needed to remove an electron from an isolated atom or molecule in physics and chemistry. Ionization energies are related with the removal of each subsequent electron, however they are most frequently employed when the initial (and loosely held) electron is removed.In an electric discharge tube, when a quickly moving electron produced by an electric current collides with a gaseous atom of the element, forcing it to expel one of its electrons, the ionization energy of a chemical element, given in joules or electron volts, is often measured.Thus, the ionization energy measures an element's capacity to participate in chemical processes that call for the creation of ions or the donation of electrons. It is often connected to the type of chemical bonds that exist between the components in the compounds they form.To view more about Ionization energy, refer to:
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Which two neutral atoms would have the same number of valence electrons, according to the highest nsxnpy in their electron configurations?ChlorineSeleniumSodiumSulfurPhosphorusCalcium
Answers
In this question, we have to choose two neutral atoms that will present the same number of valence shell electrons, in order to do that, we can look for these elements in the periodic table, the elements that are in the same group will have the same number of electrons in the valence shell, this is the case of Sulfur and Selenium, both are in group 6 and present 6 electrons in the valence shell
Nitrogen in a rigid 5 m 3
tank at 120 K and 1MPa
Answers
Nitrogen in a rigid 5 m³ tank at 120 K and 1 MPa is in a compressed and cooled state.
The nitrogen in the tank is in a compressed and cooled state. This means that the nitrogen gas has been subjected to pressure and has been cooled to a temperature of 120 K.
When a gas is compressed, its particles are forced closer together, resulting in an increase in pressure. In this case, the nitrogen gas has been compressed to a pressure of 1 MPa, which is equivalent to 10 times atmospheric pressure. This high pressure allows a larger amount of gas to be stored within the given volume of the tank.
Additionally, the nitrogen gas has been cooled to a temperature of 120 K. At lower temperatures, the kinetic energy of the gas particles decreases, causing them to move slower and exert less pressure. Cooling the gas helps to reduce its volume and increase its density, allowing more gas to be stored within the confined space of the tank.
Overall, the combination of compression and cooling enables the storage of a larger quantity of nitrogen in the given volume of the tank. This is particularly useful in various industrial applications where a large supply of nitrogen is required, such as in the food and beverage industry for preservation or in the electronics industry for inert atmospheres during manufacturing processes.
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which of the following procedures is a treatment method for acute iron toxicity?
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One treatment method for acute iron toxicity is the administration of chelating agents.
Chelating agents are substances that bind to the excess iron in the body, forming stable complexes that can be excreted through urine or feces. One commonly used chelating agent for iron toxicity is deferoxamine.
It forms a complex with iron, allowing it to be eliminated from the body.
Additionally, in severe cases, supportive care may be provided, including the administration of fluids, oxygen therapy, and treatment for symptoms such as vomiting or diarrhea.
It is essential to seek immediate medical attention in cases of iron toxicity to receive appropriate treatment and prevent further complications.
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Which of the following is a scientific question? O A. How can I make a peach cobbler? O B. What chemicals cause most plants to be green? C. What is the best color for my room? O D. Do black dogs make better pets than brown dogs?
Answers
why is mass number always a whole number?
Answers
infectious/potentially infectious waste must be stored in a leak-proof, covered container.
Answers
Infectious or potential infectious waste must be stored in a leak-proof and covered container. This is important in order to prevent the spread of any harmful pathogens or contaminants that may be present in the waste.
A leak-proof container ensures that any liquids or fluids from the waste do not seep out and contaminate the surrounding area. Meanwhile, a covered container prevents any airborne pathogens from being released and potentially infecting individuals who come into contact with the waste.
Infectious/potentially infectious waste, also known as biohazardous waste, can pose a risk to public health and the environment if not properly contained and disposed of. Storing this type of waste in a leak-proof, covered container helps prevent the spread of harmful microorganisms, reduces the risk of accidental exposure, and maintains a safe and clean environment for everyone.
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What is a property of an ionic compound?
Select all that apply.
Responses
remains intact when soaked in water
, , , , remains intact when soaked in water
insulates against heat and electricity
, , insulates against heat and electricity
conducts electricity and heat efficiently
, , conducts electricity and heat efficiently
resists melting at high temperatures
Answers
The properties of an ionic compound are as follows:
Conducts electricity and heat efficiently. Resists melting at high temperatures.Thus, the correct options for this question are C and D.
What do you mean by Ionic compound?An Ionic compound may be defined as a type of chemical compound that is significantly composed of ions that are held together by electrostatic forces referred to as ionic bonding.
The properties of ionic compounds are determined by the process through which they dissociate from one another when they dissolve in water. For example, NaCl. They are good conductors of heat and electricity.
Therefore, the correct options for this question are C and D.
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what kind of intermolecular forces are present in hcoh?
Answers
Hydrogen bonding is the intermolecular force present in HCOH.
Hydrogen bonding is a type of intermolecular force present in molecules that contain hydrogen atoms covalently bonded to oxygen, nitrogen, or fluorine. Hydrogen bonding happens when a hydrogen atom bonded to a highly electronegative atom is attracted to the unshared electrons of another electronegative atom in a nearby molecule. The molecule HCOH has hydrogen bonding.
HCOH is an acronym for hydrogen carbon oxygen hydrogen. Hydrogen bonding in HCOH molecule arises because of the presence of O-H group in the molecule. The hydrogen atom with a slightly positive charge in one HCOH molecule is attracted to the oxygen atom with a slightly negative charge in another HCOH molecule. This interaction is what leads to hydrogen bonding.
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MnO-4 + Cr(OH)3 -> CrO2-4 +MnO2
How many hydroxide ions will be in the balanced equation?
Answers
The balanced equation for the given reaction is:
16MnO4^- + 3Cr(OH)3 → 3CrO42- + 8MnO42- + 24OH^-
From the balanced equation, we can see that 24 hydroxide ions (OH^-) are produced on the product side.
Therefore, the balanced equation contains 24 hydroxide ions.
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If you start with 42 g of Fe-53, how much is left after 8.51 minutes? I
Answers
Answer:
2:38
Explanation:
Answer:
2.58 good luck with everything
How many moles of gallium chlorate, Ga(ClO3)3, must react in order to produce 674 kJ of energy according to the following reaction? 2 Ga(ClO3)3 à 2 GaCl3 + 9 O2 DH = - 130.4 kJ
Answers
Answer:
10.3 mol Ga(ClO₃)₃
Explanation:
Let's consider the following balanced thermochemical equation.
2 Ga(ClO₃)₃(s) ⇒ 2 GaCl₃(s) + 9 O₂(s) ΔH = - 130.4 kJ
According to the balanced thermochemical equation, 130.4 kJ of heat are released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:
674 kJ × 2 mol Ga(ClO₃)₃/130.4 kJ = 10.3 mol Ga(ClO₃)₃
Thermochemical equations are chemically balanced equations that take into account both the energy change and the physical states of all reactants and products. Energy is a reactant in an endothermic process, whereas it is a product in an exothermic reaction. Here the moles of Ga(ClO₃)₃ is 10.3 mol.
Let's consider the following balanced thermochemical equation.
2Ga(ClO₃)₃(s) ⇒ 2GaCl₃(s) + 9O₂(s) ΔH = - 130.4 kJ
According to the balanced thermochemical equation, 130.4 kJ of heat is released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:
674 kJ × 2 mol Ga(ClO₃)₃ / 130.4 kJ = 10.3 mol Ga(ClO₃)₃
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Think about different mixtures you’re familiar with. Describe three mixtures: one solid, one liquid, and one gas. If you can’t think of an example in each state, perform online research to help you. For each mixture, describe the atoms, molecules, or both that make it up, and state whether the mixture is heterogeneous or homogeneous.
Answers
mixtures can exist in different states, and their properties can vary accordingly. Solid mixtures like trail mix consist of distinguishable components.
How to solve the problem?
One solid mixture is trail mix, which consists of various solid components such as nuts, seeds, and dried fruit. These components are made up of molecules such as proteins, fats, and carbohydrates. Trail mix is a heterogeneous mixture as the different components can be seen and distinguished from each other.
One liquid mixture is soda, which consists of carbonated water, sugar, and flavorings. The carbonated water is a mixture of water and carbon dioxide gas, while the sugar and flavorings are made up of molecules. Soda is a homogeneous mixture as the different components are evenly distributed and cannot be distinguished from each other.
One gas mixture is air, which is a mixture of nitrogen, oxygen, carbon dioxide, and other gases. These gases are made up of atoms such as nitrogen atoms, oxygen atoms, and carbon atoms. Air is a homogeneous mixture as the different gases are evenly distributed and cannot be distinguished from each other.
In conclusion, mixtures can exist in different states, and their properties can vary accordingly. Solid mixtures like trail mix consist of distinguishable components, while liquid mixtures like soda have evenly distributed components. Gas mixtures like air are also homogeneous, and their components are not easily distinguishable from each other.
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what is diatomic element?
Answers
Answer:
it is molecular of an elements that consists two atoms
63) How many moles of CaBr
2
are in 5.0 grams of CaBr
2
2.
4.0 x 101 mol
2.5 x 10-2 mol
4.2 x 10-2 mol
1.0 x 10'mol
Answers
Answer:
I think it will be the answer
2.5 x 10-2 mol
I hope it help you
How does an enzyme’s active site relate to its substrate?
Answers
Answer:
The enzyme's active site must be the mold shape of the substrate.
Explanation:
An enzyme and a substrate bind together in order to work. If the shapes of the 2 are different, they will not be able to bond together. If the shapes of the 2 fit glove-in-hand, then they will be able to bond together.
Introduction to atoms) How do I do this
Answers
Answer:
and the answers are
1 electron cloud
2 neutron
3 no charge
4 electron shell
5 proton
6 + charge
7 nucleus
8 neutron
9 - charge
Explanation:
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write the chemical symbol of the element that makes up most of earth's core.
Answers
The chemical symbol for the element that makes up most of Earth's core is Fe, which stands for iron. Iron makes up approximately 85% of the Earth's core, with the remainder being nickel and other trace elements.
The high abundance of iron in the Earth's core is responsible for the planet's magnetic field, which is essential for life on Earth as it helps to protect us from harmful solar radiation. The study of the Earth's core and its composition is important for understanding the planet's history and evolution, as well as for predicting future changes in the Earth's magnetic field. The element that makes up most of Earth's core is iron. Its chemical symbol is Fe, which is derived from the Latin word "ferrum." Iron is the primary component of the inner and outer core, accounting for about 85% of its composition. This element plays a vital role in Earth's geophysics, including the generation of the planet's magnetic field.
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