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Concentrated sulphuric acid has density ...

Concentrated sulphuric acid has density of 1.9 g/mL and 99% `H_(2)SO_(4)` by mass. Calculate the molarity of the acid.

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The correct Answer is:
19.19M
99% `H_(2)SO_(4)` means that 99 g of `H_(2)SO_(4)` is present in 100 g of solution .
Moles of `H_(2)SO_(4) = (99)/(98) = 1.01 mol`
Vol.of solution ` = (100)/(1.9) = 52.63 mL`
Molarity ` = (1.01)/(52.63) xx 1000 = 19.19 M`
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