Physical Chemistry Answers

The standard reaction enthalpy for the docomposition of CaCl₂.NH₃(s) into CaCl₂(s) and NH₃(g) is nearly constant at +78kJmol^-1 between 350 K and 470 K. The equilibrium pressure of NH₃ in the presence of CaCl₂.NH₃ is 1.71kPa at 400K. Find an expression for the temperature dependence of change in Gibbs free energy in the same range

consider a mixture of two gases A and B, confined to a closed vessel. A quantity of a third gas, C, is added to the same vessel at the same temperature. How does the addition of gas C affect the following: A. the partial pressure of gas A, B. the total pressure in the vessel?

write a balance chemical equation of the reaction

For argon the numerical value of a is 1.337 and the numerical

value of b is 0.0320.

Use the van der Waals equation to calculate the pressure of a

sample of argon at-90.0 °C with a molar volume of 2.59 L/mol.

Round your answer to the correct number of significant digits.

A metal tank contains three gasses: oxygen, helium, and nitrogen. If the partial pressures of

the three gasses in the tank are 40 atm of O2, 10 atm of N2, and 15 atm of He, what is the total

0g of aluminum reacts with 18.0 grams of chlorine gas to produce aluminum chloride. Which reactant is limiting, which is in excess? Balanced Equation: 2 Al + 3 Cl2 -> 2 AlCl3

explain why food doesn't spoil as fast when its refrigerated as it would at room temperature

Derive an expression for isothermal reversible expansion of a gas from a volume

V1 to V2.

The reaction between solid white phosphorus and oxygen produces solid

tetraphosphorusdecoxide (P4O10).

a. Write the balanced chemical equation of the reaction. ( 5 points)

b. Determine the mass of tetraphosphorusdecoxide (P4O10) formed if 25.0 g of

phosphorus (P4) and 50.0 g of oxygen (O2) are combined. ( 5 points)

c. How much of the excess reactant remains after the reaction stops? (5 points)

250 ml of solution were prepared by dissolving of 2.3 g of the non-electrolyte in water. Calculate the molar mass of solute if the osmotic pressure of solution at 27^oC is equal to 249 Kpa.