What is relative formula mass?
Put this into an equation involving mass.
What is the difference between M(small)r and A(small)r?
1) RFM is the relative atomic masses of all of the atoms in the molecular formula added together.
2)RFM= mass/number of moles
3)M(small)r= RFM of a compound
RFM of an element
A mixture contains 20% iron ions. What mass of FeCl2 would you need to provide to make 50g of the mixture?
1) find the mass of iron in the mixture.
50 x 20/100 = 10
2) calculate the percentage mass of iron in iron chloride.
Ar x number of atoms(element)/Mr of the compound x 100
56/56+(2x35.5) x 100 = 44.09%
what is the avogadro constant?
what does one mole of carbon weigh?
complete the sentence:
one mole of atoms or _________ of any substance will have a mass (in _____) equal to the relative _______.
it is the mass of atoms or molecules of any substance has a mass of grams as the the relative atomic mass Ar(one element)