Question

Calculate the molar mass of Na2SO4 and CaCO3

Answer 1

Answer:

Na2SO4 = 142g/mol. CaCO3 = 100g/mol

Answer 2

Answer:
Each sodium molecules molecular weight is 23 grams
Na=23multiplied by 2=46
One sulphur molecule weighs 32 grams so we have only one sulphur molecule therefore sulphur weight is 32
Each oxygen molecule weighs 16grams
So there are 4 oxygen molecules so
16 multipleied by 4 =64
So molecular weight of na2so4 =molecular weight of 2 sodium molecules +one sulphur molecule +four oxygen molecules
46+32+64=142 grams therefore molecular weight of na2so4 aka sodium sulphate is 142 grmas
Caco3:
Each calcium molecule weighs 40 grmas
So there is only one calcium molecule so the weight of calcium is 40 grmas
Each carbon molecule weighs 12 grams
So there is only one carbon molecule sothe weight of carbon is 12 grams
Each oxygen molecule weighs 16 grams
So the weight of 3 oxygen molecule gives a weight of 48 grams
Molecular weight of caco3=molecular weight of calcium +molecular weight of carbon +molecular weight of 3 carbon molecules.
40+12+48=100grmas
Hope this helps u please thank me