1mol of hydrogen gas and 1 mol of iodine vapour were mixed and allowed to react. after t seconds 0.8 mol of hydrogen remained.
the number of miles of hydrogen iodide formed at t seconds was..
a) 0.2
b) 0.4
c) 0.8
d) 1.6
the answer is b but explain how you work this out?

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.