Question

Consider the balanced equation. 2hcl + mg mgcl2 + h2 if 40.0 g of hcl react with an excess of magnesium metal, what is the theoretical yield of hydrogen? 1.11 g 2.22 g 52.2 g 104 g

Answer 1

the correct answer is 1.11 g i just took the test

Answer 2

2Hcl +mg--->MgCl2+ H2
The theoretical yield of hydrogen is calculated as follows
calculate the moles of Hcl
mass/molar mass
40g/36.5=1.096 moles
by use of mole ratio of Hcl to H2 which is 2:1
moles of H2=1.096 /2=0.548moles
mass is therefore= moles x molar mass
that is 0.548moles x 2 =1.096 grams