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Posted by on Monday, January 11, 2010 at 7:38pm.

So here I am doing my HW worksheet on the ideal gas law/graham's law ad I have gotten to this one problem where I am totally stuck and confused. Please help me by telling me how to set this up and giving me tips, if necessary.

What is the mass (in grams) of ammonia gas (NH {tiny #3at the bottom}, 17g/mole contained in a 4.00 flask at 32.5 degrees Celsius and 1.6atm?

  • chemistry - , Monday, January 11, 2010 at 7:43pm

    Answered below.

  • chemistry - , Monday, January 11, 2010 at 7:49pm

    So is grams, n in the formula PV=nRT?
    I think I am starting to understand this.

  • chemistry - , Monday, January 11, 2010 at 7:54pm

    No. n in the formula PV = nRT is the number of moles.
    First you solve for n (number of moles). THEN you use the formula, moles = grams/molar mass to solve for grams (which is what the problem asks for).

  • chemistry - , Monday, January 11, 2010 at 7:57pm

    Oh! I think I understand now

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