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

Question

Chemistry

Ronin Saunders

28 December, 09:45

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

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Molly Gibbs · Answer 1

M (KNO₃) = 101.1 g/mol

M (CO (NH₂) ₂) = 60.1 g/mol

m (N) = M (N) m (KNO₃) / M (KNO₃)

m (N) = 2M (N) m (CO (NH₂) ₂) / M (CO (NH₂) ₂)

2m (CO (NH₂) ₂) / M (CO (NH₂) ₂) = m (KNO₃) / M (KNO₃)

m (CO (NH₂) ₂) = M (CO (NH₂) ₂) m (KNO₃) / (2M (KNO₃))

m (CO (NH₂) ₂) = 60.1*101.1 / (2*101.1) = 30.05 g