Posted by **Kristine** on Wednesday, October 3, 2012 at 2:52pm.

A flask has 1.00 L of O2 (g) at STP (the amount of gas and volume are held constant, P=1 bar) and the second has 1.00 L of O2 at 100 C. What mass of O2 must release if we get the pressure to remain at 1.00 bar when it's heated to 100 C?

Can someone please explain how to do this? What i tried to do was calculate the n of the first flask at STP. I got .00403mol. I then calculated the n of the second flask using n(initial)T(initial)/T(final)

I'm not sure where to go from here. I'm also not sure whether I calculated it correctly. Any help would be appreciated, thank you

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