How many moles of sodium sulphate will contain 200 kg of na?

Question

Chemical process calculation

Answer 1

Look at the chemical formula for sodium sulfate.  It is Na₂SO₄.  Note that there are two moles of Na for each mole of Na₂SO₄.  

1 mole Na = 22.99 g

1 mole Na₂SO₄ has 2 x 22.99 g Na = 45.98 g Na

1 mole Na₂SO₄/x moles Na₂SO₄ = 45.98 g/200x10³ g

x = 4.35x10³ moles = 4350 moles of Na₂SO₄

 

Done another way using dimensional analysis, or the unit factor method:

200x10³ g Na x 1 mole Na/22.99 g Na x 1 mole Na₂SO₄/2 moles Na = 4.35x10³ moles Na2SO4