1. Which of these equations is balanced, and which is not balanced? la)2C2H60 702-4002 06H20
b) 2MGCO3 O HASO4 - 2MgSO4 HOD 2002

The balanced equations are given below:

1. 2C₂H₆ + 7O₂ > 4CO₂ + 6H₂O

2. MgCO₃ + H₂SO₄ > MgSO₄ + H₂O + CO₂

Explanation:

The correct equation of the chemical reaction occurring in the two instances is given below:

C₂H₆ + O₂ > CO₂ + H₂O

MgCO₃ + H₂SO₄ > MgSO₄ + H₂O + CO₂.

To balance the equations above, we ensure that the number of moles of atoms of each element taking part in both reactions is equal on both the reactant and product side  of the reaction.

1. 2C₂H₆ + 7O₂ > 4CO₂ + 6H₂O

2. MgCO₃ + H₂SO₄ > MgSO₄ + H₂O + CO₂

The above equations are balanced. In equation 1, 4 moles of carbon atoms are present on both sides of the reaction; 12 moles of hydrogen atoms are present on both sides of the reaction; and 14 moles of oxygen atoms are present on both sides of the reaction.

In equation 2, 1 mole of magnesium atom is present on both sides of the reaction; 1 mole of carbon atom is present on both sides of the reaction; 7 moles of oxygen atoms are present on both sides of the reaction; and 2 moles of hydrogen atoms are present on both sides of the reaction.

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