I need help with question 5 whoever helps could get Brainlest or extra credit

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

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.

What was bohr’s contribution to the planetary model