1.

What is the molarity of a solution prepared by dissolving 7.1 gram Na_(2)SO_(4) in 100 mL. water ?

Answer»

0.5 M
2 M
0.2 M
0.05 M

SOLUTION :`M=(w xx 1000)/("MOLECULAR weight"xx"volume")`
`= (7.1xx1000)/(142xx100)=0.5M`


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