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Mole ratios of substances
Moles =massMr= \frac{mass}{Mr}=Mrmass (or Ar for elements)
Mg+2HCl→MgCl2+H2Mg + 2HCl \rightarrow MgCl_2 + H_2Mg+2HCl→MgCl2+H2
1 mole of Mg
2 moles of HCl
1 mole
624=0.25\frac{6}{24} = 0.25246=0.25 moles
Use mole ratios from balanced equation
Relative molecular mass
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