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In the following reaction, the total number of oxygen atoms in X and Y is ________ Na2O + H2O → 2X Cl2O7 + H2O → 2Y

1. 5
2. 4
3. 6
4. 7

Correct answer: 5

Solution

In the reaction, Na2O contributes 1 oxygen atom and H2O contributes 1 oxygen atom for a total of 2 oxygen atoms in X. Cl2O7 has 7 oxygen atoms and H2O adds another 1, giving a total of 8 oxygen atoms in Y. Therefore, the total number of oxygen atoms in X and Y is 2 + 3 = 5.

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