Question

Calculate which of the following — calcium nitrate or ammonium sulphate has a higher % of nitrogen. [Ca = 40, , O = 16, S = 32, N = 14]

Percentage Composition

Chemistry, Class 10, ICSE, J Dalal

August 1, 2024

Answer

Molecular weight of calcium nitrate Ca[NO₃]₂ = 40 + 2[(14 + 3(16))] = 40 + 2[14 + 48] = 164 g

164 g of calcium nitrate contains 28 g of nitrogen

∴ 100 g of calcium nitrate contains $28\over 164$ × 100

= 17.07% of nitrogen

Percentage by weight of nitrogen in calcium nitrate is 17.07%

Molecular weight of ammonium sulphate [NH₄]₂SO₄

= 2[14 + 4(1)] + 32 + 4(16)

= 36 + 32 + 64

= 132

132 g of ammonium sulphate contains 28 g of nitrogen

∴ 100 g of ammonium sulphate contains $28\over 132$ × 100

= 21.21% of nitrogen

Percentage by weight of nitrogen in ammonium sulphate is 21.21 %

Hence, ammonium sulphate has a higher concentration of nitrogen than calcium nitrate.

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Question

Calculate which of the following — calcium nitrate or ammonium sulphate has a higher % of nitrogen. [Ca = 40, , O = 16, S = 32, N = 14]

Answer

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