Chemistry:Stoichiometry

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Q.1: Find the volume of a sample of a gas at 699 torr if its volume was 541 mL at 1.00 atm at a constant temperature?

Q.2: If the pressure exerted on a gas in a balloon decreases from 1.01 atm to 0.562 atm as it rises, by what factor will the volume of the gas in the balloon increase as it rises ?

Q.3: What pressure (in atmospheres) is required to compress 1.00 L of gas at 760 mm of Hg presure to a volume of 50.0 mL ?

Q.4: If 525 mL of gas at 25 0 C is heated to 50 0 C at constant pressure. Calculate the new volume of the sample.

Q.5: If 0.500 mol of nitrogen gas occupies a volume of 11.2 L at 0 0 C, what volume will 2.00 mol of nitrogen occupy under the same conditions?

Q.6: If 46.2 gm of oxygen gas occupies a volume of 100 L at a particular temperature and pressure, what volume will 5.00 gm of oxygen as occupy under the same conditions?

Q.7: What volume is occupied by 5.03 gm of oxygen at 28 0 C and a pressure of 0.998 atm?

Q.8: At what temperature does 16.3 gm of nitrogen gas have a pressure of 1.25 atm in 1 25.0 L tank?

Q.9: Calculate the pressure in a 212.0 L tank

Q.10: A gaseous mixture contains 5.23 gm of nitrogen and 4.41 gm of oxygen. What volume does the mixture occupy at 25 0 C and 1.00 atm pressure?

Q.11: What pressure exists in a 25.0 L tank containing 50.1 gm of oxygen and 26.3 gm of nitrogen at 27 0 C ?

Q.12: What volume of chlorine gas at STP would be required for the complete reaction with 10.2 gm of nitrogen to form NCl3 ?

Q.13: Carbon dioxide gas is evolved when calcium carbonate is strongly heated. If 4.74 gm of calcium carbonate is strongly heated, what volume of carbon dioxide gas would be produced when collected at 26 0 C and 0.997 atm ?

Q.14: The equilibrium expression for the reaction
H 2 (g) + I 2 (g) = 2HI(g)
is ----------- .

Q.15: For the reaction
N 2 (g) + 3H 2 (g) = 2NH 3 (g)
the reaction mixture was analyzed after equilibrium was reached and the concentrations were found as [NH 3 (g)] = 0.34 M, [H 2 (g)] = 0.0021 M and [N 2 (g)] = 0.00049 M . The value of K is ----------- .

Q.16: For the reaction at a specific temperature
CaCO3 (s) = CaO(s) + CO 2 (g)
it is found that at equilibrium [CO 2 (g)] = 2.1 x 10 30 M. K for the reaction is --------- .

Q.17: Zinc carbonate dissolves in water to give a solution that is 1.7 x 10 -5 M at 22 0 C. Ksp for the reaction at this temperature is --------- .

Q.18: Copper(II) oxalate dissolves in water to give a solution containing 2.1 x 10-5 gm per liter at 25 0 C. Ksp copper(II) oxalate(s) is -------- .

Q.19: For the reaction
PCl 5 (g) = PCl 3 (g) + Cl 2 (g)
K = 4.5 x 10 30 at a certain temperature. If it is found that the concentration of PCl5 is twice the concentration of PCl3 , the concentration of Cl2 under these conditions must be ----------- .

Q.20: If K sp for silver chromate is 9.1 x 10-12 at 25 0 C, the solubility of silver chromate in gm / L is ---------- .

Q.21: What is the pOH of the solution whose pH = 1.93 ?

Q.22: The hydrogen ion concentration ( in moles per liter ) of a solution whose pH is 4.11 will be --------- .

Q.23: pH of 0.00010 M HCl solution is ---------- .





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