Question

Short answer questions
Calculate the molar mass of oxalic acid. (H=1, C = 12, O=16)
Ans.​

Answer 1

If you are talking about anhydrous Oxalic acid or H2C2O4:

Molar mass = 2 x 1 + 2 x 12 + 4 x 16 => 2 + 24 + 64 =>26+64=> 90 g per mole

=> So 1 mole of Anhydrous Oxalic acid will have a mass of 90 grams.

If you are talking about Oxalic Acid Dihydrate or H2C2O4.2H2O:

Molar mass =2 x 1 + 2 x 12 + 4 x 16 + 2 x ( 2 x 1 + 16)

=> 2 + 24 + 64 + 2(18)

=> 26 + 64 + 36

=> 90 + 36

=> 126 grams per mole.

So, 1 mole of Oxalic acid dihydrate will have a mass of 126 grams.