Question

N2 + 3H2 2NH3 How many molecules of H2 are represented in the reaction? How many nitrogen atoms are represented in the reactants? How many moles of NH3 are formed?

Answer 1

There are 3 molecules of H2.
There are 2 atoms of nitrogen presented in the reactants.
2 moles of NH3 are formed.

Answer 2

Answer :

The given balanced chemical reaction is,

$N_2+3H_2\rightarrow 2NH_3$

For part (1) :

As, 1 mole of $H_2$ molecule contains $6.022\times 10^{23}$ number of $H_2$ molecule

So, 3 mole of $H_2$ molecule contains $3\times (6.022\times 10^{23})=18.066\times 10^{23}$ number of $H_2$ molecule

Hence, the number of molecules of $H_2$ are, $18.066\times 10^{23}$

For part (2) :

As, 1 mole of $N_2$ contains $2\times (6.022\times 10^{23})=12.044\times 10^{23}$ number of nitrogen atoms

Hence, the number of nitrogen atoms represented in the reactants are, $12.044\times 10^{23}$

For part (3) :

By the stoichiometry we can say that, 1 mole of nitrogen molecule react with 3 moles of hydrogen molecule to give 2 moles of ammonia molecule.

Hence, the mole of $NH_3$ (ammonia) formed are, 2 moles.