Question

7.Which compound contains the greatest mass of nitrogen? a)0.5 moles (NH4)2SO4 b) 1 mole NH4NO3 c) 1.5 moles (NH4)3PO4 d) 2 moles CO(NH2)2

Answer 1

After calculating the mass of nitrogen in each compound, 1.5 moles of (NH4)3PO4 contains the greatest mass of nitrogen, amounting to 63.05 grams.

Step-by-step explanation:

To determine which compound contains the greatest mass of nitrogen, we calculate the total mass of nitrogen in each option provided. The molar mass of nitrogen (N) is 14.01 g/mol.

1. (NH4)2SO4 contains 2 moles of NH4 (each with one nitrogen), so 0.5 moles of (NH4)2SO4 would contain 1 mole of nitrogen, which would have a mass of 14.01 g.
2. NH4NO3 contains 2 moles of nitrogen, so 1 mole of NH4NO3 would have a nitrogen mass of 28.02 g.
3. (NH4)3PO4 contains 3 moles of NH4 (each with one nitrogen), so 1.5 moles of (NH4)3PO4 would contain 4.5 moles of nitrogen, which would have a mass of 63.05 g.
4. CO(NH2)2 (urea) contains 2 moles of nitrogen, so 2 moles of urea would contain 4 moles of nitrogen, with a total mass of 56.04 g.

Therefore, the compound from the options given that contains the greatest mass of nitrogen is 1.5 moles of (NH4)3PO4.