4(a)
The percentage composition of a gas is:
Nitrogen 82.35%, Hydrogen 17.64%.
Find the empirical formula of the gas. [N = 14, H = 1]
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| Element | % composition | At. wt. | Relative no. of atoms | Simplest ratio |
|---|---|---|---|---|
| Nitrogen | 82.35 | 14 | $\frac{82.35 }{14}$ = 5.88 | $\frac{5.88}{5.88}$ = 1 |
| Hydrogen | 17.64 | 1 | $\frac{17.64}{1}$ = 17.64 | $\frac{17.64}{5.88}$ = 3 |
Simplest ratio of whole numbers = N : H = 1 : 3
Hence, empirical formula is NH3