A sample containing 85 g of NH₃ is decomposed into nitrogen and hydrogen. The total amount of nitrogen and hydrogen present in 85 g of the sample respectively are:

70, 15

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15, 70

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56, 20

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71, 14

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Solution

The correct option is A
70, 15

The total mass of NH₃ = 85 g.

The mass ratio (N:H) = 14:3

The mass of nitrogen = $\frac{Ratio of nitrogen}{Total ratio}$ x Total mass of NH₃= $\frac{14}{17}$ x 85 = 70 g

The mass of hydrogen = $\frac{3}{17}$ x 85 = 15 g

A good practice is to check the answer using the law of conservation of mass. The mass of the reactants should be equal to the mass of the products. Here we have 70 + 15 = 85 g which is the same as that of NH₃

So, the answer is 70, 15

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A sample containing 85 g of NH3 is decomposed into nitrogen and hydrogen. The total amount of nitrogen and hydrogen present in 85 g of the sample respectively are:

A sample containing 85 g of NH₃ is decomposed into nitrogen and hydrogen. The total amount of nitrogen and hydrogen present in 85 g of the sample respectively are: