How to calculate the mass-relationship?

Question

I have difficulties figuring out how to calculate the mass-relationship between N and P in ammoniumphosphat (NH4)3PO4? Is it 1:1?

Answer 1

In one mole of (NH₄)₃PO₄, you have 3 moles of N and 1 mole of P.

The mass of 3 moles of N = 3 x 14 g/mole = 42 g

The mass of 1 mole of P = 1 x 31 g/mole = 31 g

The mass ratio of N to P = 42 g/31 g = 1.4 : 1