Versene, a chelating agent has chemical formula C2H4N2(C2H2O2Na)4. If each mole of this compound could bind 1 mole of Ca2+, then the rating of pure versene expressed as mg of CaCO3 bound per g of chelating agent is:
A
100mg
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B
163mg
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C
200mg
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D
263mg
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Solution
The correct option is C263mg Versene, C2H4N2(C2H2O2Na)4 has molar mass =380g.