A solution contains 5.3g of X_{2}CO_{3} in 500 cm^{3 }of solution. 25.0 cm^{3} of this solution required 20.0 cm^{3} of 0.25M hydrochloric acid for complete neutralization.

The equation for the reaction is;

X_{2}CO_{3} _{(aq)} + 2HCl _{(aq)} →2XCl _{(aq)} + H_{2}O _{(l)} + CO_{2 (g)}

- Calculate the concentration of X
_{2}CO_{3} solution in grams/dm^{3.} - Find the molarity of X
_{2}CO_{3} solution. - Find the relative formula mass of X
_{2}CO_{3} hence calculate the relative atomic mass of X.(C = 12, O = 16)