a boy stands on a scale and finds his weight to be 76.4 lb. if his feet cover an area of 16.9in^2 , how much pressure in lb/in^2 is the boy applying to the scale

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.