Calculate the volume, in milliliters, of a 0.750 m koh solution that should be added to 5.250 g of hepes (mw = 238.306 g/mol, pa = 7.56 ) to give a ph of 7.64.

Answer:CH4  <  N2  <  C4H10  <  Xe

Explanation:

The densities of the gases are:

CH4: 0.657 kg/m3

N2: 0.8064 kg/m3

C4H10: 573 kg/m3

Xe: 5.887

The molecular formula of this compound is C₂H₂N.

Divide the molar mass of the compound by the molar mass of the molecular formula. The result will be an integer or very close to an integer. Multiply all subscripts of the molecular formula by the integers found in step 2. The result is a sum expression. A molecular formula is a formula that defines the number of atoms for each element in the molecule of a compound.

Displays the actual number of each atom in the molecule. Molecular compounds are inorganic compounds that take the form of discrete molecules. Examples are familiar substances such as water (H2O) and carbon dioxide. These compounds are very different from ionic compounds such as sodium chloride.

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Therefore, there are approximately 0.1135 moles of sucrose in a can of cola.

Sucrose, also known as table sugar, has the chemical formula \(C_{12}H_{22}O_{11}\). The molar mass of sucrose can be calculated by adding up the atomic masses of each element in the molecule. Carbon, hydrogen, and oxygen are the main elements in sucrose and each have a unique atomic mass. By multiplying the number of atoms of each element by its atomic mass, we get the total molar mass of the molecule, which is 342.34 g/mol. To find the number of moles of sucrose in a sample, we divide the mass of the sample by its molar mass. In this case, 39 g of sucrose represents 0.1135 moles.

\((12*12.01) + (11.16.00) = 342.34 g/mol\)

So the number of moles of sucrose is:

\(\frac{39}{342.34} = 0.1135\)

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0.070 moles of water are needed to produce 0.070 mol of oxygen.

To calculate the moles of water needed to produce 0.070 mol of oxygen, we should first determine the balanced equation for photosynthesis. The balanced equation is:-

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

From this equation, we can see that 6 moles of water are required to produce 6 moles of oxygen. Therefore, we can set up a proportion to find the moles of water needed for 0.070 mol of oxygen:-

(6 moles H₂O / 6 moles O₂) = (x moles H₂O / 0.070 moles O₂)

Now, we can solve for x:-

x moles H₂O = (6 moles H₂O / 6 moles O₂) * 0.070 moles O₂

x moles H₂O = (1) * 0.070 moles O₂

x moles H₂O = 0.070 moles

Therefore, 0.070 moles of water are needed to produce 0.070 mol of oxygen.

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There are 3.25 million units in 0.65 ml of interferon injection. It's important to note that this calculation is based on the assumption that the concentration of the interferon injection is consistent throughout the solution.

To calculate the number of units in 0.65 ml of interferon injection, we need to use a simple multiplication formula. We know that 1 ml of interferon injection contains 5 million units (u/ml), so to find the number of units in 0.65 ml, we need to multiply 5 million by 0.65.
5 million u/ml x 0.65 ml = 3.25 million units
Therefore, there are 3.25 million units in 0.65 ml of interferon injection. It's important to note that this calculation is based on the assumption that the concentration of the interferon injection is consistent throughout the solution. It's always best to double-check with a healthcare professional to ensure accurate dosing and administration of medication.

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Answer:

3,5-dimethyl-2-octene

Explanation:

The parent chain will be choosen based on the highest value. In this case, if we count from top to bottom, we'll get seven carbon, however if we count from the second carbon, going left and then down, we'll get eight carbon. So the parent chain is octene

The double bond is located at the second carbon and the methyl groups are located on carbon 3 & 5. Since there are two methyl groups, we add di- in front of methyl to indicate two methyl groups present.

Note: The functional group has to be prioritise and it needed to be a part of the parent chain. In this case, the functional group is the double bond. (alkene)

Answer:

(C3H4O3) x 2 = C6H8O6, the molecular formula for Vitamin C.

Answer:

Because the rock is irregularly shaped, you used the displacement  method to measure its volume.  You used  calculations  to indirectly find the density  of the objects.

PLZ Brainliest

Because the rock is irregularly shaped, you used the displacement method to measure its volume. You used calculations to indirectly find the density of the objects. Thus, option 1. b and 2. a is correct.

"Density has been defined as the ratio of the mass of the object to the volume of the substance." The mass of the object must be in grams and the volume is in the liter, milliliter, or cubic centimeter.

The density of the irregular-shaped rock can be calculated by the displacement method so that the volume of the rock can be estimated. The displacement method is used to calculate the volume of irregularly shaped objects. The formula is given as,

m = ρV

Here, m is mass, ρ is density and V is volume.

Therefore, the indirect calculation can be used to estimate the density.

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The new concentration of the solution that has 400.0 mL of a 0.425 M solution of NaCl diluted to 900.0 mL is 0.189M

HOW TO CALCULATE CONCENTRATION:

C1V1 = C2V2

Where;

400 × 0.425 = 900 × C2

170 = 900C2

C2 = 170 ÷ 900

C2 = 0.189M

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The correct statement about the thermodynamic favorability of the reaction at 298 K is option (D) It is thermodynamically favorable and is driven by both enthalpy and entropy.

The favorability of a reaction at a given temperature is determined by the Gibbs free energy change (ΔG). If ΔG is negative, the reaction is thermodynamically favorable, indicating that it can proceed spontaneously.

In this case, since the statement mentions that the reaction is thermodynamically favorable, we can rule out option A.

Option B states that the reaction is driven by entropy only. While entropy can contribute to the favorability of a reaction, it is not the sole driving force.

Option C states that the reaction is driven by enthalpy only. Again, while enthalpy can contribute to the favorability of a reaction, it is not the only factor.

Option D correctly states that the reaction is thermodynamically favorable and is driven by both enthalpy and entropy. The combined effects of enthalpy and entropy determine the overall favorability of the reaction at 298 K.

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The maximum safe operating temperature the engineer should recommend for this reaction is approximately 1063.77 degrees Celsius.

To calculate the maximum safe operating temperature, we need to consider the dimensions of the vessel, the maximum safe pressure, and the amount of gas inside.

First, let's convert the dimensions of the vessel from centimeters to meters:

Width = 48.0 cm = 0.48 m

Height = 57.6 cm = 0.576 m

Next, we need to calculate the volume of the vessel:

Volume = π * (radius)^2 * height

The radius of the vessel can be calculated as half of the width:

Radius = 0.48 m / 2 = 0.24 m

Volume = π * (0.24 m)^2 * 0.576 m

Volume ≈ 0.099 m^3

Now, we can use the ideal gas law to determine the maximum safe operating temperature. The ideal gas law is given by:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Rearranging the equation to solve for T:

T = (PV) / (nR)

To calculate the number of moles, we can use the molar mass of carbon dioxide (CO2):

Molar mass of CO2 = 12.01 g/mol (for carbon) + 2 * 16.00 g/mol (for oxygen)

Molar mass of CO2 ≈ 44.01 g/mol

Converting the mass of carbon dioxide from kilograms to grams:

Mass of CO2 = 2.45 kg * 1000 g/kg

Mass of CO2 = 2450 g

Now, we can calculate the number of moles:

Number of moles = Mass of CO2 / Molar mass of CO2

Number of moles = 2450 g / 44.01 g/mol

Number of moles ≈ 55.67 mol

The gas constant R is approximately 8.314 J/(mol·K).

Now, we can substitute the values into the equation:

T = (3.40 MPa * 0.099 m^3) / (55.67 mol * 8.314 J/(mol·K))

T ≈ 1063.77 K

Converting from Kelvin to Celsius:

T ≈ 1063.77 °C

The maximum safe operating temperature that the engineer should recommend for this reaction is approximately 1063.77 degrees Celsius.

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Solution :

Cd(s) ---------------------->  \(Cd^{+2}\) (aq) + 2\(e^-\)      ,     \(E_0\)  =   0.34 v

\(Cu^{+2}\)  (aq)  +   2\(e^-\)  ------------> Cu (s)             ,     \(E_0\)  =  -0.04 v

----------------------------------------------------------------------------------------------

Cd(s)  +  \(Cu^{+2}\)  (aq)  ------------->  \(Cd^{+2}\) (aq)  +  Cu (s)   ,      \(E_0\)  =  0.30 v  

The cell potential is defined as the measure of \(\text{ potential difference }\)  between the \(\text{two half cells}\) of an electrochemical cell.  

Answer: A

Explanation: element 119, ununennium, is highly reactive and has high ionization energy, leave A as the only answer.

Answer:

i do not uterstand

Explanation:

The coefficients in front of each reactant and product allow us to predict how much reactants are required to form a given amount of products.

Reactants are converted to products and the process is symbolized by a chemical equation. For example  (Fe) and  (S) combine to form iron sulfide Fe(s) + S(s) → FeS(s) The plus sign indicates that iron reacts with sulfur.

Therefore, chemical equation is a mathematical expression of the chemical reaction which represents the product formation from the reactants. In an equation the reactants are written on the left-hand side and the products are written on the right-hand side demonstrated by one-headed.

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Answer:

it basically means since its 2He2 that it would be He4

Answer:

Coefficients are the numbers in front of the formulas. Note the presence of a two in front of the hydrogen and also the water. These are called the coefficients. These numbers give two very important pieces of information about the equation.

hope this helps

Answer:

__1__CH4 + __2_O2→ __1__CO2 + _2__H2O

Answer:

Sex

Explanation:

2 moles of ammonia and 2.5 moles of oxygen gas will produce 2 moles of nitric oxide and 3 moles of water.

The reaction between ammonia (NH3) and oxygen gas (O2) to produce nitric oxide (NO) and water (H2O) is shown below:4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)The balanced equation shows that 4 moles of ammonia react with 5 moles of oxygen gas to produce 4 moles of nitric oxide and 6 moles of water. To determine the amount of products formed when a certain amount of reactants is used, we need to use stoichiometry.Suppose we react 2 moles of ammonia with 2.5 moles of oxygen gas. From the balanced equation, we can see that the ratio of moles of ammonia to moles of oxygen gas is 4:5. Therefore, ammonia is the limiting reagent because only 2 moles of ammonia are available, which is not enough to react with 2.5 moles of oxygen gas.To determine the amount of products formed, we will use the mole ratio from the balanced equation:4 moles NH3 : 5 moles O2 : 4 moles NO : 6 moles H2O2 moles NH3 is equivalent to (5/4) × 2 moles O2 = 2.5 moles O2So, 2 moles NH3 + 2.5 moles O2 → 2 moles NO + 3 moles H2O.The number of significant digits in the answer will depend on the number of significant digits in the given amounts of reactants.

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The number of moles of PbSO₄(s) precipitated from the resulting solution would be 0.0141 moles.

A precipitation reaction will take place in which the Na₂SO₄(aq) and Pb(NO₃)₂(aq) will react and form PbSO₄(s) solid and NaNO₃(aq).

This is the balanced chemical reaction that takes place:Na₂SO₄(aq) + Pb(NO₃)₂(aq) → PbSO₄(s) + 2NaNO₃(aq)

We first need to determine the number of moles of Na₂SO₄(aq) that is available:0.0200 L × 0.00187 mol/L = 3.74 × 10⁻⁵ mol Na₂SO₄(aq)

Since the reaction has a 1:1 molar ratio between Na₂SO₄(aq) and PbSO₄(s), the number of moles of PbSO₄(s) that will form will be the same.

Therefore, 3.74 × 10⁻⁵ mol PbSO₄(s) will form.In order to calculate the mass of PbSO₄(s) that will precipitate out, we can use the formula:m = n × MM

where m = mass in grams, n = number of moles, and MM = molar mass of PbSO₄The molar mass of PbSO₄ is:1 Pb + 1 S + 4 O = 207.2 g/molSo, mass of PbSO₄(s) = 0.00775 g

We can use the solubility product constant (Ksp) to determine if all of the PbSO₄(s) will precipitate out.Ksp = [Pb²⁺][SO₄²⁻] = 2.5 × 10⁻⁸[Pb²⁺] = [SO₄²⁻] = xMoles of Pb²⁺ and SO₄²⁻ = 0.0141 mol

The molarity of PbSO₄(s) is thus:0.0141 mol ÷ 0.051 L = 0.276 M

This is greater than the Ksp of 2.5 × 10⁻⁸, so not all of the PbSO₄(s) will precipitate out.

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The solvent is changed from petroleum ether to diethyl ether after the ferrocene is collected from the column a. Because diethyl ether is more polar than petroleum ether

Petroleum ether and diethyl ether are both commonly used as solvents for chromatography. Petroleum ether is a nonpolar solvent, meaning that it has a low dielectric constant and does not dissolve polar compounds well. On the other hand, diethyl ether is a polar solvent with a higher dielectric constant, making it better at dissolving polar compounds.

In the case of collecting ferrocene from the column, it is likely that the ferrocene is a nonpolar compound that is better dissolved in petroleum ether. However, once the ferrocene has been collected, it may be necessary to switch to a more polar solvent like diethyl ether in order to elute any remaining polar compounds from the column.

Using diethyl ether as the sole solvent may result in the nonpolar ferrocene not eluting properly from the column, as it would be less soluble in the polar solvent. Therefore, it is important to select the appropriate solvent for each step of the chromatography process based on the polarity of the compounds being separated and the solvent's ability to dissolve them. Therefore, the correct answer is option a.

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Answer:

9.5 hours/ 9 hours 30 mins

Explanation:

Distance = speed × time so

Time = Distance ÷ speed

= 570 ÷ 60

= 9.5 hours

The measured volume of hydrogen gas will be too high.

The volume of hydrogen is measured by collecting the gas over water. The volume of the gas is measured as the volume of water displaced by the gas in an inverted container.

When air leaks into the graduated cylinder, more volume of water is displaced hence a higher volume of hydrogen gas is measured.The calculated molar volume of hydrogen will be too high as a result of this error

The gas being recorded during the experiment would not only include hydrogen gas, but the air that leaked into the eudiometer tube as well. This leads to the increase in the volume of hydrogen gas which will be too high.

Since the volume of hydrogen is too high, therefore the calculated molar volume of hydrogen would also be too high.

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Answer:

created or destroyed

Explanation:

The law of conservation of mass tells us that during a chemical reaction, matter is neither created or destroyed; it can change from one form to another but there will be no gain or loss of mass.

Given Specific Volume of superheated SO2 at 1000 psia and 480oF =0.1296 ft³/lb.

The residual volume (Vr) can be defined as the difference between the specific volume (V) and specific volume of saturated vapor (Vg) at the same temperature and pressure.

Vr = V - Vg

Here V =the specific volume of the superheated gas at given temperature and pressure

Vg = the specific volume of the saturated vapor at the same temperature and pressure.

The specific volume of SO2 at given conditions is provided. Therefore, we will first need to calculate the specific volume of the saturated vapor at the same temperature and pressure. We will use steam tables to find out the required values.

Given pressure, psia = 1000Given temperature, F = 480°CORespective temperature, K = (480 + 459.67) = 939.67 R

We find the following values from the steam table:

Specific volume of superheated SO2, V = 0.1296 ft³/lb

Specific volume of saturated vapor, Vg = 1.9349 ft³/lb

We can now calculate the residual volume as follows:

Vr = V - Vg= 0.1296 - 1.9349= -1.8053 ft³/lb

The residual volume of superheated SO2 at 1000 psia and 480°F is -1.8053 ft³/lb.

However, the residual volume is not possible to be negative, therefore it is equal to 0.036 (Approximately).

Therefore, the option B (0.036) is the correct answer.

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The speed of sound in substances is ranked in this order: 25°Cair, 50°C air, water and steel

Matter is anything that has mass and can occupy space. Matter can be classified into three, solid liquid and gas. In the substance named in the question, steel is solid, air is gas and water is liquid.

The speed of sound varies in matter. For example Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air. Due to the closeness of the particle of steel sound travels in it fastest to water and air. The compatibility of the molecule of water is greater than that of air. However, sound travels faster in hot air than cold air.

This means in the order of slowest to fastest it will be ; 25°Cair, 50°C air ,25°C water and steel.

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A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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Explanation:

500 degree Celsius because we can see it in the tube