Question

What volume of hydrogen gas at STP is produced from the reaction of three moles of zinc with an excess of hydrochloric acid ? a) 22.4 L b) 33.6 L c) 44.8 L d) 67.2 L

Answer 1

Answer: d. 67.2

Explanation:

Zn+ 2HCL → ZnCl2+ H2

ammount of H2 produced is equal to ammount of Zn consumed.

1 mol ideal gas occupies 22.4 L at STP

H2 will occupy (3 mol×22.4 L/mol) = 67.2 L