Calculate how many grams of magnesium oxide is formed when burning 6g magnesium. Write down the reaction equation.

1) We write the reaction equation and arrange the coefficients: 2Mg + O2 = 2MgO.
2) Calculate n (amount of substance) for magnesium by the formula: n = m (Mg) / M (Mg) = 6/24 = 0.25 mol.
3) The amount of magnesium oxide substance is equal to the amount of magnesium substance and is equal to 0.25 mol (according to the equation: 2 mol of magnesium accounts for 2 mol of magnesium oxide).
4) Find the mass of magnesium oxide by the formula: m (MgO) = n (MgO) * M (MgO) = (the amount of magnesium oxide substance is multiplied by the molar mass of magnesium oxide) = 0.25 * (24 + 16) = 0.25 * 40 = 10g – the answer.