QUESTION 4 A flask has 1.50 moles of hydrogen gas at 30.0 °C and a pressure of 375 mm Hg. After the addition of more hydrogen gas at the
same temperature, the pressure rises to 1.50 atm. How many moles of hydrogen gas are added? 1 atm - 760 mm Hg.

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.