Question

1. Gaseous phosphorus trifluoride is prepared by the reaction of phosphine and fluorine: 4 PH_3 (g) + 3 F_2 (g) --> 3 PH_4F (s) + PF_3 (g) If you mix PH_3 and F_2 in the correct stoichiometric ratio, and if the total pressure of the mixture is 0.2 atm, then what is the final total pressure in the flask? (Assume T is constant and the reactants have been completely consumed)

a) 0.029 atm

b) 0.114 atm

c) 0.200 atm

d) 1 atm

e) Not enough information

2. A flask is first evacuated so that it contains no gas at all. Then 4.4 g of carbon dioxide is introduced into the flask. On warming to 22 degrees C, the gas exerts a pressure of 0.242 atm. What is the volume of the flask? C: 12.01 g/mol; O: 16.0 g/mol; R = 0.0821 L*atm/mol*K

a) 27 L

b) 4.93 L

c) 0.34 L

d) 1.25 L

e) 10 L

Answer 1