Chemistry
Some of the fertilizers are sodium nitrate NaNO3, ammonium sulphate (NH4)2SO4 and urea CO(NH2)2. Which of these contains the highest percentage of nitrogen?
Mole Concept
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Answer
(i) Molar mass of NaNO3 = 23 + 14 + 3(16) = 23 + 14 + 48 = 85 g
Nitrogen in 85 g NaNO3 = 14 g
∴ Percentage of Nitrogen in NaNO3 = x 100 = 16.47%
(ii) Molar mass of (NH4)2SO4 = 2[14 + 4(1)] + 32 + 4(16) = 36 + 32 + 64 = 132 g
Nitrogen in 132 g of (NH4)2SO4 = 28 g
∴ Percentage of Nitrogen in (NH4)2SO4 = x 100 = 21.21%
(iii) Molar mass of CO(NH2)2 = 12 + 16 + 2[14 + (2 x 1)]
= 28 + 2(16)
= 28 + 32
= 60 g
Nitrogen in 60 g of CO(NH2)2 = 2 x 14 = 28 g
∴ Percentage of Nitrogen in CO(NH2)2 = x 100 = 46.66%
So, the highest percentage of Nitrogen is in Urea.
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