When 1.5 grams of magnesium burns, how many grams of magnesium oxide will be formed?

Question

a) Write a balanced chemical equation for the above reaction.

b) Show by unit conversion (show conversion factors, ie. 2 g H20 x 1 mole H2O/18 g H2O x ...... x ...... = answer

Answer 1

2Mg + O2 ==> 2MgO

mols Mg = g/molar mass = ?
Use the coefficients in the balanced equation to convert mols Mg to mols MgO.
? mol Mg x (2 mol MgO/2 mol Mg) = ? mol Mg x (2/2) = x mol MgO.

g MgO = mols MgO x molar mass MgO.