Nitric oxide reacts with oxygen according to the equation

CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance

Problem

2\,\mathrm{NO}(g)+\mathrm{O_2}(g)\;\longrightarrow\;2\,\mathrm{NO_2}(g)

. In a controlled study of atmospheric chemistry, a reaction vessel initially contains

5.00\times10^{22}

molecules of

\mathrm{NO}

and

1.50\times10^{22}

molecules of

\mathrm{O_2}

at the same temperature and pressure. Answer the following. (a) Convert the initial quantities of

\mathrm{NO}

and

\mathrm{O_2}

to amount in moles. (b) Identify the limiting reactant and justify your choice with a calculation based on the balanced equation. (c) Calculate the amount, in moles, of

\mathrm{NO_2}

that can be produced under these conditions. (d) Determine the number of

\mathrm{NO_2}

molecules formed if the reaction proceeds to completion.

Related theory

Stoichiometric calculations
Some Basic Concepts of Chemistry
Limiting reactants
Stoichiometry and Limiting Reagent

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