10.0 g of calcium nitrate is heated at 100 kPa and a temperature of 3 degrees C, at which temperature it fully decomposes.
Calculate:
a) the volume of nitrogen dioxide evolved.
b) the volume of oxygen evolved.
c) the total volume of gas evolved.
Equation:
2Ca(NO3)2(s)→2CaO(s)+4NO2(g)+O2(g)
Answers
If 10.0 g of calcium nitrate is heated at 100 kPa and a temperature of 3 degrees C,
a) the volume of nitrogen dioxide evolved is 5.87 L
b) the volume of oxygen evolved is 1.47 L.
c) the total volume of gas evolved is 7.34 L.
To solve this problem, we first need to determine the limiting reactant between Ca(NO\(_3\))\(_2\) and the decomposing temperature of 3°C. The decomposition of Ca(NO\(_3\))\(_2\) is endothermic, and the decomposition rate increases with temperature, so we assume that the reaction proceeds to completion.
The molar mass of Ca(NO\(_3\))\(_2\) is 164.1 g/mol. Therefore, the number of moles of Ca(NO\(_3\))\(_2\) present in 10.0 g is:
n(Ca(NO\(_3\))\(_2\)) = m/M = 10.0 g / 164.1 g/mol = 0.0609 mol
According to the balanced chemical equation, the stoichiometric ratio between Ca(NO\(_3\))\(_2\) and the evolved gases is:
2 mol Ca(NO\(_3\))\(_2\) : 4 mol NO\(_2\) : 1 mol O\(_2\)
a) The volume of NO\(_2\) evolved:
From the ideal gas law, the volume of NO\(_2\) evolved at 100 kPa and 3°C is:
V(NO\(_2\)) = n(NO\(_2\)) * R * T / P
where R is the gas constant (8.31 J/(mol K)), T is the temperature in Kelvin (3°C = 276 K), and P is the pressure in kilopascals.
The number of moles of NO\(_2\) produced is:
n(NO\(_2\)) = 4 * n(Ca(NO\(_3\))\(_2\)) = 4 * 0.0609 mol = 0.2436 mol
Substituting the values into the equation, we get:
V(NO\(_2\)) = 0.2436 mol * 8.31 J/(mol K) * 276 K / (100 kPa) = 5.87 L
Therefore, the volume of NO\(_2\) evolved is 5.87 L.
b) The volume of O\(_2\) evolved:
The number of moles of O\(_2\) produced is:
n(O\(_2\)) = 1 * n(Ca(NO\(_3\))\(_2\)) = 1 * 0.0609 mol = 0.0609 mol
Using the ideal gas law as before, we get:
V(O\(_2\)) = n(O\(_2\)) * R * T / P = 0.0609 mol * 8.31 J/(mol K) * 276 K / (100 kPa) = 1.47 L
Therefore, the volume of O\(_2\) evolved is 1.47 L.
c) The total volume of gas evolved:
The total number of moles of gas produced is:
n(total) = 4 * n(Ca(NO\(_3\))\(_2\)) + 1 * n(Ca(NO\(_3\))\(_2\)) = 5 * n(Ca(NO\(_3\))\(_2\)) = 0.3045 mol
Using the ideal gas law once again, we get:
V(total) = n(total) * R * T / P = 0.3045 mol * 8.31 J/(mol K) * 276 K / (100 kPa) = 7.34 L
Therefore, the total volume of gas evolved is 7.34 L.
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Related Questions
In making her morning tea, Dorothy drops a sugar cube into some hot water. She stirs the mixture but no longer sees the sugar cube at the bottom of her mug. Based on her observation of sugar dissolving in hot water, she can properly conclude that the sugar is
Answers
Answer:
Hydrophilic
Explanation:
A hydrophilic substance is any substance that interacts efficiently with water.
Since water is a polar solvent, a hydrophilic substance must also be polar in order to interact with water since like dissolves like in chemistry.
The fact that sugar disappears in hot water indicates that sugar is a polar hydrophilic substance because only a polar solute can dissolve in water
Based on her observation of sugar dissolving in hot water, she can properly
conclude that the sugar is hydrophilic.
A substance is said to be hydrophilic when it is able to react and dissolve in
water due to the attractive force between them. Hydrophobic substances
don't dissolve in water.
In this scenario, we were told the sugar dissolved completely in water which
means that the sugar is hydrophilic.
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What's the difference between bases and alkalis? Can you tell by the pH of a substance?
Answers
EXPLANATION:
Firstly, we need to define a base and alkali
A base is a substance that can neutralize the acid by reacting with hydrogen or hydroxonium ions
An alkali is a soluble base. This implies that alkali is a base that dissolves in water
Hence, all Akali are bases and all bases are not alkali
When the base neutralizes acid by reacting with a hydrogen ion, the resulting ions will be negatively charged which is the Hydroxyl ion
\(H^++OH^-\rightarrow H_2^{}O\)
Convert a anthracite coal price of$90/ton to$/MMBtu. Heat content of anthracite coal is 15,000 Btu/pound.$15.52/MMBtu\$3/MMBtu \$90.00/MMBtu 3.86/MMBtu
Answers
The coal cost of $90/ton with an intensity content of 7000 BTU for every pound is D: $6.42/MMBtu.
The recipe to compute MMBtu from tons is as per the following -
Cost per mmbtu = cost per ton × 500/BTU per pound
Keep the qualities in the equation to find the cost per MMBtu
Cost per mmbtu = (90×500)/7000
Performing augmentation in the numerator on Right Hand Side of the situation
Cost per mmbtu = 45000/7000
Performing division on Right Hand Side of the situation to find the cost per MMBtu for coal
Cost per mmbtu = $6.42/mmbtu
Accordingly, the right choice is D: $6.42/MMBtu.
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Home heating system, identify two other feedback control systems that can be found in most residences. describe briefly how each of them works; include sensor, actuator, and controller information.
Answers
A home heating system typically includes two other feedback control systems: thermostat control and water heater control.
Thermostat control is a widely used feedback control system in residences to regulate indoor temperature. It consists of a sensor, actuator, and controller. The sensor, usually a thermometer, measures the ambient temperature in the living space. The controller compares the measured temperature with the desired setpoint and determines if heating or cooling is required. The actuator, typically a furnace or air conditioning unit, adjusts the heating or cooling output based on the controller's instructions. Once the ambient temperature reaches the setpoint, the controller signals the actuator to stop heating or cooling, maintaining a comfortable temperature in the residence.
Another common feedback control system found in residences is the water heater control. This system ensures the water temperature is maintained at a desired level. The sensor, often a thermostat, measures the temperature of the water in the heater. The controller compares the measured temperature with the desired setpoint. If the water temperature falls below the setpoint, the controller activates the actuator, such as a heating element, to raise the water temperature. Once the desired temperature is reached, the controller instructs the actuator to stop heating, ensuring a constant supply of hot water for various household needs.
Overall, both thermostat control and water heater control systems in residences rely on sensors to measure relevant parameters, controllers to compare the measured values with desired setpoints, and actuators to adjust the heating or cooling output or water temperature accordingly. These feedback control systems play crucial roles in maintaining comfort and convenience in households.
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how does the difference between the ranges of the strong nuclear force and the coulomb force affect the makeup of each atom’s nucleus?
Answers
Each atom's nucleus is influenced by the nuclear force depending on how the strong nuclear force and the Coulomb force differ from one another. because heavier atoms have more neutrons than protons and the coulomb force has a larger sphere of action.
What is atom's nucleus?
A strong nuclear force acts on the neutrons and protons that make up an atom's nucleus. Unlike the coulomb or gravitational forces, this force is distinct. The strong nuclear force is the force that holds nucleons together. It is a powerful force with a limited range. The nucleons, or neutrons and protons, are drawn together by the same force. For smaller atomic nuclei, the nuclear force is stronger than the Coulomb force. At distances of roughly 0.8 femtometre.the nuclear force is very attractive between nucleons.
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How is a scientific law different from other laws in society?
A. A scientific law serves to protect people, property, and nature from
harm.
OB. A scientific law describes what always happens under specific
conditions in nature.
C. A scientific law is a rule about how to treat and punish people.
D. A scientific law is what scientists have decided should be forced
to happen in nature.
Answers
Answer:
B. A scientific law describes what always happens under specific
conditions in nature.
Explanation:
Scientific law is something that has been proven over and over and therefore is always correct under conditions in nature.
Answer:
B. A scientific law describes what always happens under specific
conditions in nature.
Explanation:
Scientific law is based on observation and experiments to support a claim. It usually describes nature.
An electrochemical cell operates because the electrodes in the two half-cells differ in their electrical potential. A metal electrode composed of ______ reducing agent will have a greater electrical potential to push electrons toward the electrode composed of a ______ reducing agent.
Answers
A metal electrode composed of strong reducing agent will have a greater
electrical potential to push electrons toward the electrode composed of a
weak reducing agent.
Strong reducing agents are compounds which donates or loses electrons
with a corresponding increase in the oxidation state. Weak reducing agents
can also be referred to as oxidizing agents and they accept the electrons
from the strong reducing agents which results in a reduction in the oxidation
state.
The strong reducing agent has a greater electric potential which aids the
electrons being pushed towards the electrodes with a weak reducing agent.
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Help me please What makes water filters better
Answers
Answer:
well according to salesman they take out all and out all bacteria that is in the water that the water filters installed in the systems already don't take out so in other wordsthere and the water filter takes that out
Which of the following chemical equations follows the law of conservation of mass?
Answers
Answer:
The third choice
Explanation:
The law of conservation of mass tells us that the mass of the reactants and products in a chemical reaction will be equal to one another. Equations follow the law of conservation of mass when they are balanced, which means that they have the same number and type of atoms on each side.
When individual atoms are counted, the third choice has the same number and type of atoms on each side: 1 gallium, three cesium and three fluorine.
The last point of comparison is to look at oxygen isotope data for this time interval. It is a tricky business to estimate temperature from isotope values from so long ago because quite a bit can change about both oceans and organisms over such a long time. People who study these super ancient isotope records feel that some corrections are needed to account for these changes. I am mostly (but not 100%) convinced that they are justified. If you want, I can give you the paper where they explain the basis for the corrections, but it involves some serious chemistry.
C) Chemical proxies for temperature
In the graph below, the uncorrected values are shown with the blue line. The corrected values are shown with either the red or the dashed black line (there are two different ways of doing the corrections). They are roughly the same, so let's use the dashed black line as it is a little easier to see. 5) How well do the uncorrected dOvalues correspond with CO, levels? What about the corrected dashed black line? Sometimes we are looking at whether something is increasing or decreasing. In this case I want you to also look at where the values lie relative to today (the horizontal dashed line at 0°C)
6) Does this argue for or against the notion that CO2 concentration is one of
Answers
We can analyze the relationship between the uncorrected dO (oxygen isotope) values and CO2 levels, as well as the corrected dashed black line values.
In terms of the uncorrected dO values, it is unclear how well they correspond with CO2 levels since the specific correlation or trend is not mentioned. Without further details or data, we cannot determine the exact relationship between the uncorrected dO values and CO2 levels.
However, regarding the corrected dashed black line values, we can observe their alignment with the horizontal dashed line at 0°C, which represents today's temperature. By assessing where the corrected values lie relative to this line, we can gain insights into temperature changes over time.
Based on the information provided, we cannot definitively conclude whether this argues for or against the notion that CO2 concentration is one of the main drivers of climate change. The given context focuses on comparing the dO values with CO2 levels and temperature, without explicitly addressing the relationship between CO2 concentration and climate change. To draw conclusions about the impact of CO2 concentration on climate change, further analysis and information about the specific trends and patterns are required.
Overall, without additional data and details, it is challenging to determine the exact correspondence between the uncorrected dO values and CO2 levels, as well as the implications for the role of CO2 concentration in climate change. Further examination of the provided paper and relevant scientific literature would provide a more comprehensive understanding of the topic.
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How many moles of platinum atoms are in 2.408 x 1023
Answers
answer:
The mass of 4×10²¹ atoms Pt is ≈ 1 g Pt.
explanation:
I NEED HELP ASAP!!!!!!!!!!!
WITHIN THE HOUR
Thanks
Answers
Li = 6
Be =9
C= 12
O=15
Answer:
C
Explanation:
Actually, arranged to the size of smallest to least atom radius size = C
Atomic sizes generally get smaller as you go from L to R across a row of the periodic table.
A high pressure system generally indicates?
Question 9 options:
tornadoes
rain
fair weather
Answers
An HNO3 (ag) solution has a pH of 1.75. What is the molarconcentration of the HNO3(aq) solution?
Answers
⇒ 0.018
-use pH=-log[H3O+]
-solve for H3O+
The momentum of a 23 000 kg truck traveling eastward with a velocity of 50.0 m/s is kom/s
Answers
Answer:
Explanation:
I'm not sure what you mean by the units. The answer using kg and ms is 23000 * 50 = 1150000 kg m/s
Consider the compounds with the generic formulas listed below and theircorresponaing molar solonities in pure water. AX; molar solubility = 1.41×10^-4 M AX,; molar solubility = 2.28×10^-4 MA2X; molar solubility = 1.70×10^-4 M• Part AWhich compound will have the smallest value of Ksp?
Answers
Comparing the Ksp values for the two compounds, we see that AX has a larger Ksp (1.9881×10⁻⁸) compared to AX₂ (1.897152×10⁻¹¹). Therefore, AX₂ will have the smallest value of Ksp.
To determine which compound will have the smallest value of Ksp, we need to compare the solubility products (Ksp) of the compounds based on their molar solubilities in water.
The solubility product (Ksp) is a constant that represents the equilibrium between a solid compound and its dissolved ions in a saturated solution. It is calculated by multiplying the concentrations of the ions raised to the power of their respective stoichiometric coefficients.
Let's compare the compounds:
Compound AX: Molar solubility = 1.41×10⁻⁴ M
The balanced equation for its dissolution in water can be represented as: AX(s) ⇄ A⁺(aq) + X⁻(aq)
The Ksp expression for this compound is: Ksp = [A⁺][X⁻]
Since the molar solubility is given, we can substitute it into the Ksp expression:
Ksp = (1.41×10⁻⁴)² = 1.9881×10⁻⁸
Compound AX₂: Molar solubility = 2.28×10⁻⁴ M
The balanced equation for its dissolution in water can be represented as: AX₂(s) ⇄ A₂+(aq) + 2X⁻(aq)
The Ksp expression for this compound is: Ksp = [A₂⁺][X⁻]²
Substituting the molar solubility:
Ksp = (2.28×10⁻⁴)(2.28×10⁻⁴)² = 1.897152×10⁻¹¹
Comparing the Ksp values for the two compounds, we see that AX has a larger Ksp (1.9881×10⁻⁸) compared to AX₂ (1.897152×10⁻¹¹). Therefore, AX₂ will have the smallest value of Ksp.
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in the fe-fe3c system, there are a number of important temperatures and compositions to remember. what is the temperature and composition that defines the pearlite transformation?
Answers
During pearlite transformation the temperature drops down to 600 degree C and it occurs in the Eutectic point.
What is phase diagram?
Graphical representations of the phases that exist in an alloy under various temperature, pressure, or chemical composition conditions are called phase diagrams.
The graphic illustrates the necessary elements for the equilibrium of two or more phases. A site where water can coexist in three different phases at once is described as a "triple point" in the water phase diagram, for instance. This occurs at a temperature of 0.01 °C and an atmospheric pressure of 0.006.
The pearlite transformation happens when the temperature changes from 675 degree C to 600 degree C. The point where which the transformation occurs is called as Eutectic point.
Eutectic point - A junction of several phases is known as a eutectic point. In the iron-carbon alloy diagram, the intersection of lines A1, A3, and ACM is known as the eutectic point. These points happened to develop at the same time.
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You order a glass of lemonade, 150 mL, in a restaurant only to discover that it is warm and too sweet. The sugar concentration of the lemonade is 2.27 M but you would like it to be reduced to a concentration of 1.88 M.How many grams of ice should you add to the lemonade, knowing that only a third of the ice will melt before you take your first sip? (Assume the density of water is 1.00 g/mL)
Answers
Since no sugar will be added or removed, the number or moles of it in the glas won't change.
Let's call this quantity:
\(n_s\)The molar concetrnation can be written as the followin equation:
\(C=\frac{n_s}{V}\)Where C is the concentration given the number of moles of sugar and the volume V.
We can rewrite this as:
\(n_s=C\cdot V\)Now, before the ice melts, the volume of the lemonate is 150 mL and the sugar concentration is 2.27 mol/L. Let's call this situation 1:
\(n_s=C_1\cdot V_1\)After the ice melt the one third it will, we will have a certain volume and the concentration we want 1.88 mol/L. Let's call this situation 2:
\(n_s=C_2\cdot V_2\)Now, we can put thouse tofether:
\(\begin{gathered} n_s=n_s \\ C_1\cdot V_1=C_2\cdot V_2 \end{gathered}\)And we can solve for the unknown volume of situation 2:
\(V_2=\frac{C_1\cdot V_1}{C_2}=\frac{2.27M\cdot150mL}{1.88M}=\frac{340.5}{1.88}mL=181.117\ldots mL\approx181mL\)Since the final volume is approximately 181 mL, the difference between it and the initial volume is the volume of water that came from the melted part of the ice:
\(181mL-150mL=31mL\)Since we assume that the density of the water is 1.00 g/mL, we can calculate the mass it represents:
\(\begin{gathered} \rho=\frac{m}{V}_{} \\ m=\rho\cdot V=1.00g/mL\cdot31mL=31g \end{gathered}\)And since this is only 1 third of the ice (the rest won;t melt), we know that the whole ice will have three times this mass:
\(m_{ice}=3\cdot31g=93g\)So, it should be added approximatelt 93 grams of ice.
the ch resonance at d 4.0 is listed as having a ddq pattern. what is that an abbreviation for and what accounts for that observed pattern? (explain which neighbors account for the different parts of the splitting pattern
Answers
2,3-Dichloro-5,6-Dicyanobenzoquinone is abbreviation of DDQ.
A stronger oxidant than 1,4-benzoquinone, DDQ (2,3-dichloro-5,6-dicyanobenzoquinone) is employed as a reagent for oxidative couplings, cyclization processes, and the dehydrogenation of hydroaromatic compounds.
What in chemical chemistry is DDQ?
In dry conditions, the powerful oxidizing quinone DDQ is eternally stable. It is frequently used to create aromatic and,-unsaturated carbonyls from organic molecules as well as to convert activated methylene and hydroxy groups into carbonyl compounds.
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The nail below is being measured with a ruler using the side with centimeters What is the correct way to record this measurement using the correct number of significant figures?
Answers
The correct way to record this measurement using the correct number of significant figures is 6.35 cm.
What is the correct way to record the measurement of the nail?Measurements are taken with a certain number of significant figures.
The number of significant figures in a measurement depends on the uncertainty in the measurement of the instrument.
The level of uncertainty in the measurement of a cm ruler is ±0.05 cm.
Considering the measurement of the nail:
The measurement of the nail is 6.3 ±0.05 cm.
Therefore, the correct way to record this measurement using the correct number of significant figures is 6.35 cm.
In conclusion, the number of significant figures in a measurement depends on the uncertainty in the instrument.
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calcium + nitrous acid → calcium nitrite
+
nitrogen monoxide
+ water
Answers
Answer:
It is double displacement reaction
What are the characteristics of Venus
Answers
Answer:
Venus is very hot because of the clouds that surround it. It is roughly the same size as Earth, it is just a little smaller. Venus is a rocky planet and has a lot of volcanoes.
That's all I know, you might have to research it. :/
The revival of jansenism, which centered on miracles that allegedly happened at the grave of a jansenist priest, is evidence of what development within french catholicism?
Answers
The evidence of the revival of Jansenism is the desire of ordinary people to connect themselves to what they saw as the direct work of God.
What is Jansenism?Jansenism is a theological movement that is done with the mixing of Catholicism. It was active in France's kingdom.
Primarily throughout the seventeenth and eighteenth centuries, Jansenism flourished inside Roman Catholicism before being denounced as heresy in 1653 by Pope Innocent X.
Thus, the yearning of common people to participate in what they perceived as God's direct action is proof of the rebirth of Jansenism.
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You can increase the strength of an electromagnet by
A. changing the position of the compass.
B. adjusting the magnetic declination.
C. using a stronger ferromagnetic material for the core.
D. reversing the magnetic domains.
Answers
Answer:
A. changing the position of the compass
Since the number of atoms in a substance is so large, a unit to count them was created. This unit is the number of atoms in 12
grams of carbon-12 known as
A)
a mole
B)
a formula unit
Avogadro's number
D)
an atomic mass unit
Answers
how do we know that a chemical reaction occured
Answers
Answer: signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Explanation:
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Are the following equations balanced or unbalanced?
Answers
Answer:
a is unbalanced and bcd is balanced
What types of charges does water use to form electrolytic
solutions?
Answers
Answer:
Water does not use any charges to form electrolytic solutions.
Explanation:
Electrolytic solutions are formed by substances that dissolve in water to form ions that are free to move and carry an electrical charge.
What is an electrolyte solution?
An electrolyte solution is a solution in which the solvent is a liquid and the solute is an electrolyte. Electrolytes are substances that can conduct electricity when dissolved in a solvent because they break up into cations (positively charged ions) and anions (negatively charged ions) which carry an electric charge. These charged ions in the solution facilitate the flow of electric current through the solution.
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Help me please!
What is the solubility of KNO3 in 100g of water at 60°C?
A.
28 grams/100g of H2O
B.
45 grams/100g of H2O
C.
108 grams/100g of H2O
D.
38 grams/100g of H2O
Answers
Answer:
C. 108 grams/100g of H2ORequired number is the vertical coordinate of the intersection point of a line at 60°C with the graph of the KNO₃.
Forget Hydrogen, you’re my number one element ;)
Answers
Answer:
thanks
Explanation:
u a real one 4 tht