If you change the original equation \(2H_2 + O_2 \rightarrow 2H_2O\) to \(3H_2 + O_2\), you would need to balance it. The balanced equation would be:
\[ 4H_2 + O_2 \rightarrow 4H_2O \]
In this scenario, you have 4 hydrogen molecules combining with 1 oxygen molecule to produce 4 water molecules.
Now, let's analyze the statements:
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The result of the equation will be the same. - Incorrect. The products would differ based on the number of molecules of hydrogen used.
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It is not possible to produce water without leftover molecules. - Correct if you adjust the hydrogen to 3, as you would have leftover hydrogen (3 hydrogen molecules would only fully react with 1.5 oxygen molecules, which doesn't exist as a whole number).
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Each oxygen molecule will combine with 2 hydrogen molecules with no leftover molecules. - Incorrect. An oxygen molecule combines with 4 hydrogen in the balanced equation above.
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The equation will produce three molecules of water. - Incorrect. It would produce 4 molecules of water (if we balance it to 4 hydrogen).
Thus, the correct statement is:
It is not possible to produce water without leftover molecules.