2.27 The combustion of a thin wire of magnesium metal (Mg) in an atmosphere of pure oxygen produces the brilliant light of a flashbulb, once commonly used in photography. After the reaction, a thin film of magnesium oxide is seen on the inside of the bulb. The equation for the reaction is 2Mg+O 2 → 2MgO (a) State in words how this equation is read. (b) Give the formula(s) of the reactants. (c) Give the formula(s) of the products.
2.27 The combustion of a thin wire of magnesium metal (Mg) in an atmosphere of pure oxygen produces the brilliant light of a flashbulb, once commonly used in photography. After the reaction, a thin film of magnesium oxide is seen on the inside of the bulb. The equation for the reaction is 2Mg+O 2 → 2MgO (a) State in words how this equation is read. (b) Give the formula(s) of the reactants. (c) Give the formula(s) of the products.
2.27 The combustion of a thin wire of magnesium metal (Mg) in an atmosphere of pure oxygen produces the brilliant light of a flashbulb, once commonly used in photography. After the reaction, a thin film of magnesium oxide is seen on the inside of the bulb. The equation for the reaction is
2.43 g magnesium was completely burnt in oxygen to give magnesium oxide. 2 Mg(s) + O2(g) → 2 MgO(s)
(Relative atomic masses: O = 16.0, Mg = 24.3)
(a) Draw the electronic diagrams of O2 and MgO, showing electrons in the outermost shell only.
(b) (i) How many mole of magnesium was present? (ii) How many mole of oxygen was required to completely react with the amount of magnesium in (i)?
(iii) Hence, calculate the amount of oxygen required to completely react with the magnesium.
(c) Similarly, calculate the amount of MgO formed.
2.90 grams of phosphorus is burned in the presence of oxygen and forms 5.14 grams of a phosphorus oxide. What is the emperical formula of the phosphorus oxide formed? Then write a balanced equation for the formation of the phosphorus oxide.
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