Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ∘C, the total pressure in the container is 3.60 atm . Calculate the partial pressure of propane in the container.

Q.3. What kind of post-translational modifications are taking place on collagen? (there are many. So please check the literature carefully). Why are they important for its structure? In terms of post translational processing of collagen, explain why chicken soup that is liquid when cooked fresh, becomes a gel like material upon refrigeration overnight.

Calculate the average thickness of copper on the surface of a penny (produced after 1983) in units of a.) mm and b.) atoms of Cu. Show all calculations, including unit analysis.

A scientist tries to generate a mixture of gases similar to a volcano by introducing 30.0 g of H20 vapor, 7.5 g of SO2, and 2.0 g of CO2 into a 30.0 L vessel held at 110.0˚C. (a)Calculate the total pressure of the CO2 in the mixture if the gasses don’t react. However, water and CO2 react to make liquid carbonic acid H2CO3. Write the balanced chemical reaction. Assuming the reaction is complete, how much carbonic acid is formed and how much of each molecule is in the gas phase. Finally, what is the pressure of the mixture if H2CO3 is not in the vapor phase?

The change in enthalpy for a reaction is -25.8kJ. The equilibrium constant for the reaction is 1400 at 25 degrees Celsius. What is the equilibrium constant at 382 degrees Celsius?

The dibasic compound B (pKb1 = 4.00, pKb2 = 8.00) was titrated with 1.00 M HCl. The initial solution of B was 0.100 M and had a volume of 100.0 mL. Find the pH at the following volumes of acid added and make a graph of pH versus Va; Va=0, 1, 5, 9, 10, 11, 15, 19, 20, and 22mL.

What distance does electromagnetic radiation travel in 10.2 fs ? Express your answer using three significant figures.

Part A

What is the frequency of radiation that has a wavelength of 11 μm , about the size of a bacterium?

Express your answer using two significant figures.

What is the wavelength of radiation that has a frequency of 5.40×10¹⁴ s−1 ?

Would the radiations in part (a) or part (b) be visible to the human eye?

The radiation in (a) is "visible" to humans. The radiation in (b) is "visible" to humans

.What distance does electromagnetic radiation travel in 50.0 μs ?

14. Define the following in your own words

Specific heat capacity

State function

Standard State

Enthalpy change

Heat

Temperature

NO3-(aq)+4H+(aq)+3e->NO(g)+2H2O(l) E=0.96V
ClO2(g)+e->ClO2-(aq) E=0.95V
Cu2+(aq)+2e->Cu(s) E=0.34V
2H+(aq)+2e->H2(g) E=0.00V
Pb2+(aq)+2e->Pb(s) E=-0.13V
Fe2+(aq)+2e->Fe(s) E=-0.45V

Use appropriate data to calculate E?cell for the reaction.
3Cu(s)+2NO3-(aq)+8H+(aq)->3Cu2+(aq)+2NO(g)+4H2O(l)

Express your answer using two decimal places.

When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g), if 24.3 g of Mg and 75.0 g of HCl are allowed to react, calculate the mass of MgCl2 that is produced

Predict the products for the following reactions. If no reaction will occur, write NR. Remember to balance all reactions and include states of matter.

1.) Cu^2+ (aq) + Au (s) -->

2. Ni^2+ (aq) + Na (s) -->

Using the following balance equation P₄ (s) + 6F₂ (g) ----> 4PF₃ (g)

What mass of F₂ is needed to produce 120. g of PF₃ if the reaction has a 78.1% yield?

To convert from a given quantity of one reactant or product to the quantity of another reactant or product: First, convert the given quantity to moles. Use molar masses to convert masses to moles, and use Avogadro's number (6.02×1023 particles per mole) to convert number of particles to moles. Next, convert moles of the given reactant or product to moles of the desired reactant or product using the coefficients of the balanced chemical equation. For example, in the chemical equation 2H2+O2→2H2O the coefficients tell us that 2 mol of H2 reacts with 1 mol of O2 to produce 2 mol of H2O. Finally, convert moles of the desired reactant or product back to the desired units. Again, use molar masses to convert from moles to masses, and use Avogadro's number to convert from moles to number of particles.

Hydrogen gas, H2, reacts with nitrogen gas, N2, to form ammonia gas, NH3, according to the equation 3H2(g)+N2(g)→2NH3(g)

NOTE: Throughout this tutorial use molar masses expressed to five significant figures.

Part A: How many moles of NH3 can be produced from 21.0 mol of H2 and excess N2?

Part B: How many grams of NH3 can be produced from 4.99 mol of N2 and excess H2.

Part C: How many grams of H2 are needed to produce 12.43 g of NH3?

Part D: How many molecules (not moles) of NH3 are produced from 4.35×10−4 g of H2?