Question

Suppose 3.4 g of zinc is treated with 9.0 g of pure hydrogen chloride. What is the maximum mass (in g) of hydrogen gas that can be produced? The balanced chemical equation is given below:

Zn + 2 HCl → ZnCl2 + H2

Express your answer to two significant figures.

Answer 1

n(Zn)

$n=\frac{m}{M}=\frac{3.4}{65.38}=0.05$

n(HCL)

$n=\frac{m}{M}=\frac{9}{36.4609}=0.24$

decide further on zinc, in shortage

n(H₂)=n(Zn)=0.05

m(H₂)

$m=n\times M=0.05\times2.016=0.1$ g