Which of the following equations is balanced?A.2Na2SO4(aq) + CaCl2(aq) CaSO4(s) + 2NaCl(aq)B.Na2SO4(aq) + CaCl2(aq) CaSO4(s) + NaCl(aq)C.Na2SO4(aq) + 2CaCl2(aq) CaSO4(s) + NaCl(aq)D.Na2SO4(aq) + CaCl2(aq) CaSO4(s) + 2NaCl(aq)
Question
Which of the following equations is balanced?A.2Na2SO4(aq) + CaCl2(aq) CaSO4(s) + 2NaCl(aq)B.Na2SO4(aq) + CaCl2(aq) CaSO4(s) + NaCl(aq)C.Na2SO4(aq) + 2CaCl2(aq) CaSO4(s) + NaCl(aq)D.Na2SO4(aq) + CaCl2(aq) CaSO4(s) + 2NaCl(aq)
Solution
The balanced equation is D. Na2SO4(aq) + CaCl2(aq) -> CaSO4(s) + 2NaCl(aq).
Here's why:
In a balanced chemical equation, the number of atoms for each element in the reactants (left side of the equation) must be equal to the number of atoms for each element in the products (right side of the equation).
For option D:
On the left side, we have 2 Na, 1 S, 4 O, 1 Ca, and 2 Cl atoms.
On the right side, we also have 2 Na, 1 S, 4 O, 1 Ca, and 2 Cl atoms.
Since the number of atoms for each element is the same on both sides, option D is the balanced equation.
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