2. Zinc metal reacts with HCL similarly to magnesium: Zn(s) + 2HCL(aq) = ZnCl2(aq) + H2(g). the H2 gas produced was collected over water at 25 degrees Celsius and had a volume of 7.80L at 0.980 atm. How many grams of Zn were consumed in the reaction? (Vapor pressure of water at 25C = 23.8mmHg)

Answer 1

Use PV = nRT
P = 0.980 - (23.8/760)
V = 7.8L
n = solve for this
R = 0.08206
T = 298
1 mol H2 = 1 mol Zn
g Zn = mols x molar mass.

Answer 2

19.8g