Answer to Question #287973 in General Chemistry for Nals

Question

Calculate the mass of hydrogen formed when 3 g of aluminum reacts with excess hydrochloric acid according to the balanced equation: 2Al + 6 HCl → 2 AlCl3 + 3 H2

molar masses

Answer 1

Molar mass of Al= 26.982

3/26.982= 0.11mol

Mole ratio Al:H2= 2:3

Molar mass of H2= 2.0014

2.0014×2/3×0.11

= 0.15g