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Nitrogen and hydrogen combine together to form ammonia.
$N_{2} + 3 H_{2} \to 2 {NH}_{3}$ [Relative atomic masses of $N = 14, H = 1$ ]. The mass of nitrogen and hydrogen which combine together

to form 6.8 g ammonia is

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N_{2} = 2.8 g, H_{2} = 4.0 g

N_{2} = 5.6 g, H_{2} = 1.2 g

N_{2} = 4.0 g, H_{2} = 2.8 g

N_{2} = 1.2 g, H_{2} = 5.6 g

answer is B.

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Detailed Solution

N_{2} + 3 H_{2} \to 2 {NH}_{3}

$28 g + 6 g 34 g$

$? \leftarrow 6.8 g$

$\frac{6.8 \times 6}{34}$ $\to 1.2 g of H_{2}$

$28 g \overset{N_{2}}{\to} 34 g {NH}_{3}$

$? N_{2} \leftarrow 6.8 g {NH}_{3}$

$\frac{28 \times 6.8}{34} \Rightarrow 5.6 g of N_{2}$

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