Question

2H2 + O2- 2H20

Answer 1

Conversion factor : molar mass/molecular weight

Mass of H₂O produced = 72 g

Further explanation

Given

Reaction

2H2 + O2- 2H20

8 grams of H2

Required

Conversion factors

Solution

We can use the molar mass of the components and the mole ratio as conversion factors for the above equation

mol H₂ (MW = 2 g/mol) :

$\tt mol=\dfrac{8}{2}=4~mol$

From the equation, mol ratio of H₂ : H₂O = 2 : 2, so mol H₂O = 4 mol

mass H₂O(MW = 18 g/mol) :

mass = mol x MW

mass = 4 x 18

mass = 72 g