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Help please.
Which mass of urea, CO(NH2)2, contains the same mass of nitrogen as 101.1 g of potassium nitrate?
A 22g B 30g C 44g D 60g

Respuesta :

nordico
Answer is B = 30g

Solution:
Mass of Kno3 = (39 + 14 + 3*16) = 101.1g ~ 101g

Mass of Co(NH2)2 = 12 + 16 + (14+2)*2
=(28+32)g = 60g

60g of urea contains 2 * 14g N
i.e 14 * 2g N is contained in 60gCo(NH2)2
= 60/2g = 30g urea

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