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bigd

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Volume % and Ideal Gas Law
« on: November 05, 2007, 10:28:44 AM »

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.
« Last Edit: November 09, 2007, 05:44:05 AM by bigd »
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CT101

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Re: Volume % and Ideal Gas Law
« Reply #1 on: November 05, 2007, 02:16:30 PM »

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

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Re: Volume % and Ideal Gas Law
« Reply #2 on: November 05, 2007, 05:08:28 PM »

Thank you
« Last Edit: November 09, 2007, 05:45:24 AM by bigd »
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AWK

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Re: Volume % and Ideal Gas Law
« Reply #3 on: November 05, 2007, 07:10:24 PM »

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