Which of the following statements is/are corrects?

Options

A. `21.2 g` sample of impure of `Na_(2) CO_(3) = CaCO_(3) = 0.1 mol`.
B. The percentage of moles of `Na_(2)CO_(3) ` is 60%
C. The number of mole of `Na_(2)CO_(3) = CaCO_(3) = 0.1 mol`
D. The number of moles of `NaCl` formed is 0.1 mol

Answer

A, C

Explanation

`Mw "of" CaCO_(3) = 100, Mw "of" Na_(2) CO_(3) = 106`
`Mw "of"HNO_(3) = 63 g mol^(-1)`
`Na_(2) CO_(3) + CaCl_(2) rarr CaCO_(3) + 2 NaCl`
a. moles of `CaCO_(3) = (10)/(100) = 0.1 "mol"`
Mole of `Na_(2)CO_(3) = "Moles of" CaCO_(3) -= 2 xx` moles of `NaCl`
Weight of `Na_(2)CO_(3) = 0.1 xx 106 = 10.6g`
% purity `Na_(2)CO_(3) = (10.6)/(21.2) xx = 50%`
b. wrong.
c. Correct.
Mole of `NaCl = 2 xx 0.1 = 0.2 "mol"`