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17 December, 11:57

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

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  1. 17 December, 15:08
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    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
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