Question

Calculate the mass of 5 moles of water and1.5 moles of nitrogen atoms​

Answer 1

1) Molar mass of water = 18 g mol^​​-1
The mass of 1 mole of water = 18 g
Mass of 5 moles of water = 5$\times$18 = 90 g

2) Atomic mass of nitrogen atom = 14 u
1 mole of nitrogen atom = 14 g
1.5 moles of nitrogen atom = 14$\times$1.5 = 21 g