Which subatomic particle has the least mass?
1. electron
2. proton
3. neutron
4. nucleus

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.

How many moles are contained in 5.6 l of h2 at stp

One nanometer is equal to how many meters?