How many kilograms are in 4 moles of Na2CO3?

First you need to find the amount of mass of Na2CO3 in one moles

(Use periodic chart)

Na = 22.99 x 2 = 45.98

C = 12.01

O = 16.00 x 4 = 64.00

Add the molar masses together to get 121.99

To find how many grams are in 4 moles, times 121.99 by 4

This gives you 487.96

But the questions asks for the answer to be in kilograms nor grams, to change into kilograms divide by 1000

This gets you the answer: 0.49 kg