Wednesday
July 23, 2014

Homework Help: Chemistry

Posted by Michael on Sunday, May 26, 2013 at 10:30pm.

Nitric acid is commonly purchased as a 16 M solution, which has a density of 1.41 g/mL.
Convert this molarity to a) mass percentage, b) molality, c) mole fraction.

A) 16molHNO3(63.02HNO3/1MolHNO3)=1,008.32gHNO3
- 1,000gH20(1MolH20/1.41ml/g)=1410ml/mol
w/w= 1008.32/1410= 71.5%w/w

B)1410-1008.32= 401.88 --> 16molHNO3/401.32= 0.40m

C)71.5%w/w (1mol/63.02)= 1.13--> 1.13
100gSoln(1ml/1.41)= 70.92--> .113/.71= .16 mol frac

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