Question

how many grams are there in,
1) 5 moles of oxygen and
2) 10 moles of sodium

Answer 1

1 mole of oxygen=16g
5 mole of oxygen=16×5
=80g
(2) 1 mole of Na= 23g
10 mole of Na=23g×10
=230g

Answer 2

1. Molecular mass of O2 is 32u

So, molar mass of O2 is 32g

So 32g = 1 mole

So, in 5 mole there are 32 *5= 160g of O2s.

2. Molar mass of sodium = 23

So 23 g= 1 mol

So, in 10 mole of sodium is 23*10= 230g