Versene, a chelating agent having chemical formula `C_(2)H_(4)N_(2)(C_(2)H_(4)O_(2)Na)_4`. If each mole of this compound could bind 1 mole fo `Ca^(2+)`, then the rating of pure versene expressed as mg of `CaCO_(3)` bound per g of chelating agent is

Options

A. 100 mg
B. 163 mg
C. 200 mg
D. 263 mg

Answer

D

Explanation

1 mole `Ca^(2+) = 1` mole `CaCO_(3) = 100g`
Rating = mg of `CaCO_(3)` needed per g chelating agent
mol. Wt` =380 = (100 xx 10^(3))/(380) = 263 mg`