1.25 How are 0.50 mol Na2CO3 and 0.50 M Na2CO3 different?

Molar mass of Na2CO3 = (2 × 23) + 12.00 + (3× 16) = 106 g mol–1
Now, 1 mole of Na2CO3 means 106 g of Na2CO3.
0.5 mol of Na2CO3 = 106g1 mole x 0.5 mol Na2CO3
= 53 g Na2CO3
⇒ 0.50 M of Na2CO3 = 0.50 mol/L Na2CO3
Hence, 0.50 mol of Na2CO3 is present in 1 L of water or 53 g of Na2CO3 is present in 1 L of water