15g of Magnesium is burned, what mass of magnesium oxide is formed ?
- Write out the equation when Magnesium is burned to produce Magnesium oxide: 2Mg + O2 > 2MgOMagnesium to Magnesium oxide is 1:12) Work out the number of moles present in 15g of Magnesium: Moles = Mass/Relative Mass Relative mass of Magnesium = 24 moles = 15g/24 = 0.625 molesSince the proportion of Magnesium to Magnesium oxide is 1:1, this suggests both of them have the same moles. 3) Calculate the mass of 0.625 moles of Magnesium oxide: Mass = Relative mass x Moles Relative mass of Magnesium oxide = 40 Mass = 40 x 0.625 moles = 25g
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