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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: bigd on November 05, 2007, 04:28:44 PM

Title: Volume % and Ideal Gas Law
Post by: bigd on November 05, 2007, 04:28:44 PM

Rubbing alcohol is 70.% isopropyl by volume. How many ml of isopropyl alcohol are in a 1 pint (473 ml) container? I think the answer is 330 ml, but I need help setting the equation up.

A gas sample contains 4.0 g of CH4 and 2.0 g of He. What is the volume of the sample at STP? I think the answer is 17 L, is this right?
V= nRT/P. I converted 4.0 g and 2.0 g to moles and then added them together to get n.

Title: Re: Volume % and Ideal Gas Law
Post by: CT101 on November 05, 2007, 08:16:30 PM

Check your math on the IPA problem. The gas one is correct.

Title: Re: Volume % and Ideal Gas Law
Post by: bigd on November 05, 2007, 11:08:28 PM

Thank you

Title: Re: Volume % and Ideal Gas Law
Post by: AWK on November 06, 2007, 01:10:24 AM

70 % (v/v) means 70 ml in 100 ml of solution.