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27 October, 05:34

Which mass of urea CO (NH2) 2 contains same mass of nitrogen as 101.1 g of potassium nitrate?

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  1. 27 October, 06:20
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    Calculate according to standard atomic weight, potassium nitrate (KNO3) 's nitrogen content is 14 / (39+14+16*3) = 13.86%. So 101.1 g of potassium nitrate contains 101.1*13.86% = 14.01 g nitrogen. Urea CO (NH2) 2's nitrogen content is 14*2 / (12+16+14*2+1*4) = 46.67%, so to have the same amount of nitrogen, the mass of urea needs to be 14.01/46.67% = 30.02 g.
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