CHEMISTRY HOMEWORK HELP (DESPERATE)

Posted on 2014-03-25 08:58:00 in Chemistry by DIANA

Please help me with these chem. questions! I really need help!



1)A helium filled balloon at sea level has a volume of 2.1L at 0.998atm and 36ºC. If it rises to an elevation at which the pressure is 0.900atm and the temperature is 28ºC, what will be the new volume of the balloon?



2)A sample of gas of unknown pressure occupies 0.766dm3 at a temperature of 298K. The same sample of gas is then tested under known conditions and has a pressure of 32.6kPa and occupies 0.644dm3 at 303K. What was the original pressure of the gas?



3)Determine the R value in for 1 mol of gas at STP in mmHg



4)Find the total pressure in torr for a mixture that contains four gases with partial pressures of 5.00 kPa, 4.56 psi, 302 mm Hg, and 1.20 kPa.

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