How much hydrogen will react with 16 g of oxygen?

Given:

m (O2) = 16 g;

To find:

V (H2) -?

Decision:

1) We compose the reaction equation corresponding to the condition of the problem:

2H2 + O2 = 2H2O;

2) Find the amount of oxygen contained in 16 grams of gas:

n (O2) = m: M = 16 g: 32 g / mol = 0.5 mol;

3) We compose a logical expression:

if 1 mol of O2 requires 2 mol of H2,

then 0.5 mol O2 will require x mol H2,

then x = 1 mol.

4) Find the volume of hydrogen required for the reaction to proceed:

V (H2) = n * Vm = 1 mol * 22.4 L / mol = 22.4 L;

Answer: V (H2) = 22.4 liters.