Stoichiometry Mcqs for Chemical

Q.  A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ?

a. 350
b. 485
c. 140
d. 345


ANSWER: See Answer
 
No explanation is available for this question!
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