I'm assuming MJ, ZMD, dxd is a pattern. If all are the same person, please be advised that it helps us help you if you keep the same screen name.
(P1V1/T1) = (P2V2/T2) will work all of these gas law problems if you remember to use Kelvin and not C for temperature.
For gas law problems that has moles (or grams that must be converted to mols) in it then PV = nRT is the one to use.
A helium-filled weather balloon has a volume of 842 L at 18.9°C and 758 mmHg. It is released and rises to an altitude of 6.99 km, where the pressure is 375 mmHg and the temperature is –24.1°C.
The volume of the balloon at this altitude is___ L.
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