In organic compounds<span>, any atom that is not carbon or hydrogen is called a/an____. The abbreviation"R" in a chemical formula </span>represents<span> a functional group or a hydrocarbon portion of the molecule. i hoped that helped alittle</span>
It is defined as the amount of a substance that contains as many particles as there are atoms in 12 grams of pure carbon-12. So, 1 molecule contains 6.022×10^23 elementary entities of the substance.
Hope that helps
In the reduction-oxidation reaction given, Cu is reduced because it gained 2 electrons, on the other hand H2 is oxidized because it gained one electron. I hope this helps.
1 mole ------------ 6.02x10²³ atoms
? moles ----------- 3.01x10²³ atoms
moles = ( 3.01x10²³ ) x 1 / 6.02x10²³
=> 0.5 moles Mg
