Question

2H2(g) + O2(g)gives rise to 2H2O(l)

Calculate the number of hydrogen molecules participated in above reaction?​

Answer 1

H2 molecules=2

H atoms = 4

Answer 2

2H2+O2→2H2O

Molecular mass of H2=2 g/mol

Molecular mass of O2=32 g/mol

From  the balanced chemical equation,

2×2=4 g of hydrogen requires 32 g of Oxygen to react completely

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