Na2CO3 + 2HCl → 2 NaCl + H2O + CO2 in the above reaction 5.3 g of Na2CO3 was reacted with excess of HCl . 1.8 g of CO2 was obtained. what is the % purity of Na2CO3?

Na2CO3 + 2HCl → 2 NaCl + H2O + CO2 in the above reaction 5.3 g of Na2CO3 was reacted with excess of HCl . 1.8 g of CO2 was obtained. what is the % purity of Na2CO3?