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  4. The molarity of HNO3 in a sample which has density 1.4 g / mL and mass percentage of 63% is . (Molecular Weight of HNO3 = 63)

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Q. The molarity of $HNO_3$ in a sample which has density 1.4 g / mL and mass percentage of 63% is __________. (Molecular Weight of $HNO_3 = 63$)

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Solution:

$100\, gm \,soln \to 63 gm HNO_{3}$
$\frac{100}{1.4} mL \to1 mole HNO_{3}$
$Molarity=\frac{1}{\frac{100}{1.4}\times\frac{1}{1000}}=14 M$