If 32g of impure calcium trioxocarbonate (IV) react with excess HCl liberating 4.26 dm³ of carbon (IV) oxide measured at S.T.P, calculate the percentage of purity of the impure salt [Ca=40, O=16, C=12] [1 mole of gas at S.T.P = 22.4 dm³]
a. 40%
b. 50%
c. 60%
d. 70%
