A sample of methane gas collected at a pressure of 1.41 atm and a temperature of 25.0 C is found to occupy a volume of 20.3 liters. How many moles of...

1. A sample of methane gas collected at a pressure of 1.41 atm and a temperature of 25.0 °C is found to occupy a volume of 20.3 liters. How many moles of CH4 gas are in the sample?  ___ mol

2- oxygen1.23286588O2

A helium-filled weather balloon has a volume of 646 L at 15.9°C and 758 mmHg. It is released and rises to an altitude of 5.65 km, where the pressure is 448 mmHg and the temperature is -17.1°C.

The volume of the balloon at this altitude is ___ L.

4- A sample of krypton gas occupies a volume of 7.82 L at 43.0°C and0.830 atm.

If it is desired to decrease the volume of the gas sample to 5.39 L, while increasing its pressure to 1.02 atm, the temperature of the gas sample at the new volume and pressure must be ___ °C.

5- methane0.625203 °634heated916

oxygen79736 °7.78heated72 °