Question

Consider the reaction 2h2 + o2 →2h2o if a mixture of 1.0 mole of H2 and 1.0 mole of O2 is taken, how many grams of H2O can form?

Answer 1

Balanced chemical equation is:

2 H2 + O2 ---> 2 H2O

2 mol of H2 reacts with 1 mol of O2

for 1 mol of H2, 0.5 mol of O2 is required

But we have 1 mol of O2

so, H2 is limiting reagent

we will use H2 in further calculation

Molar mass of H2O,

MM = 2*MM(H) + 1*MM(O)

= 2*1.008 + 1*16.0

= 18.016 g/mol

According to balanced equation

mol of H2O formed = (2/2)* moles of H2

= (2/2)*1

= 1 mol

mass of H2O = number of mol * molar mass

= 1*18.02

= 18.02 g

Answer: 18.0 g