How to find the amount of moles in a compound
Asked by admin @ in Chemistry viewed by 304 People
Determine the number of moles of compound in each of the following samples.?
4.50g H2O
471.6g Ba(OH)2
129.68g Fe3(PO4)2
Answered by admin @
For the answer to the question above, we have to use this formula
moles equal mass divided by the molar mass
a) 4.50 g divided by the molar mass of water
molar mass of water = 2x1.0 + 1x16.0 = 18
4.50 g / 18.0 g per mole = 0.25 moles
b) 471.6 g / Molar mass of Ba(OH)2 = moles
c) 129.68 g / molar mass of Fe3(PO4)2 = moles
atoms of P in Mg3(PO4)2
2 atoms of P in each molecule of Mg3(PO4)2
247 g / molar mass of Mg3(PO4)2 = moles
moles of Mg3(PO4)2 x 6.022x10^23 = molecules of Mg3(PO4)2
I hope my answers gave you clarity on your question.
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