CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance
Problem
Calcium carbide, CaC2(s), is placed in a rigid 8.00 L vessel at 350 K that already contains water vapor at a pressure of 0.250 atm. CaC2 reacts completely with the water vapor to produce acetylene gas, C2H2(g), and Ca(OH)2(s):
CaC2(s) + 2 H2O(g) → C2H2(g) + Ca(OH)2(s)
If 5.00 g of CaC2 is used and the temperature remains 350 K, what is the total pressure in the vessel after the reaction is complete?
(a) 0.280atm
(b) 0.780atm
(c) 0.530atm
(d) 0.125atm