(PLEASE HELP!!)A gas has a volume of 1000.0 mL at a temperature of 20.OKand a pressure of 1.0 atm. What will be the new volume when the temperature is changed to 40.0K and the pressure is changed to 0.5 atm?

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.