Question

Ammonia NH3 chemically reacts with oxygen gas O2 to produce nitric oxide NO and water H2O

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What mass of oxygen gas is consumed by the reaction of 9.89 g of ammonia?

Answer 1

$2NH_3+\dfrac{5}{2}O_2\longrightarrow 2NO+3H_2O$

Mass of NH₃ reacted = 9.89 g

Moles of NH₃ = $\dfrac{9.89}{17}=0.581\space mol$

According to balanced chemical reaction

2 moles of NH₃ react with 2.5 moles of O₂

$\therefore0.581\space mol$ of NH₃ reacts with = $\dfrac{2.5}{2}\times0.581\space mol$ of O₂

$\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space=0.727\space mol$ of O₂

Mass of O₂ consumed = $0.727\times32=23.27\space g$