Give the chemical formulae for ammonia and compute the ratio by mass of the combining elements.

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Solution

$N_{2} + 3 H_{2} \to 2 {N H}_{3}$
Ratio of mass of combining elements $= \frac{28}{2 \times 3} = 14 : 3$

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Q. Find the ratio by mass of the combining elements in ammonia :

Why do elements combine? What is meant by the term chemical formula? Give one example to explain it. [3 MARKS]

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Give the chemical formulae for ammonia and compute the ratio by mass of the combining elements.

N2+3H2→2NH3Ratio of mass of combining elements =282×3=14:3

$N_{2} + 3 H_{2} \to 2 {N H}_{3}$
Ratio of mass of combining elements $= \frac{28}{2 \times 3} = 14 : 3$