Posted by Anna on Wednesday, April 18, 2012 at 11:05pm.
The long way of doing this is to use PV = nRT, make up a P and T and solve for volume of 10.0 g Ne and multiply that by 2. [n Ne = grams/molar mass.] Then use PV = nRT again, same P and T, substitute 2xV for Ne and solve for n He, than convert to grams He.
Short way is V = n*k
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