3 questions please answer all and show your work. 
1. A sample of helium gas occupies 140 mL

at 350 mmHg. For a gas sample at constant temperature, determine the volume of helium at 560 mmHg.

2.A gas at a temperature of 105 degrees C occupies a volume of 250 mL.   Assuming constant pressure, determine the volume at 10 degrees C.

3.For a gas at standard temperature and pressure with a density of 1.05 g/L, determine its molar mass.

Step-by-step answer

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