To balance the new equation where we start with 3 \( H_2 \) molecules instead of 2, we rewrite the equation as follows:
\[ 3H_2 + O_2 \rightarrow ? H_2O \]
In this case, each water molecule (\( H_2O \)) contains 2 hydrogen atoms. Therefore, if we have 3 \( H_2 \) molecules, that gives us a total of 6 hydrogen atoms. To produce water, we would need:
\[ \text{Number of } H_2O = \frac{6 \text{ hydrogen atoms}}{2 \text{ per } H_2O} = 3 \text{ molecules of } H_2O \]
Next, we need to balance the equation completely. Since there are 3 \( H_2O \) produced, we also need to account for the oxygen. Each \( H_2O \) molecule contains 1 oxygen atom, so:
\[ 3H_2 + \frac{3}{2}O_2 \rightarrow 3H_2O \]
However, we prefer not to use fractions, so we can multiply everything by 2 to get whole numbers:
\[ 6H_2 + 3O_2 \rightarrow 6H_2O \]
Now, if we consider the original statements you provided, we can determine which one is correct based on this balanced equation.
The key points from the balanced equation are:
- 6 hydrogen atoms combine with 3 oxygen atoms to produce 6 water molecules.
- There are no leftover molecules.
Here are the provided statements assessed:
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It is not possible to produce water without leftover molecules. - This is incorrect; we can produce water without leftover molecules.
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The result of the equation will be the same. - This is misleading; while water is produced, the specifics (number of molecules) change.
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The equation will produce three molecules of water. - This is incorrect; it produces six molecules of water.
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Each oxygen molecule will combine with 2 hydrogen molecules with no leftover molecules. - This is correct in the context that every \( O_2 \) can combine with 4 \( H_2 \) to produce 4 \( H_2O \), but this isn't directly what we need for the 3 \( H_2 \) scenario.
The best fit from the available responses given the new balanced reaction of 6 \( H_2O \) formation from 6 \( H_2 \) would be related to no leftover molecules, aligning closely with the essence of the last option rather than producing leftover reactants.
Therefore, the correct response closely aligns with:
Each oxygen molecule will combine with 2 hydrogen molecules with no leftover molecules.
Thus, I would consider that insight as fitting, while ensuring no confusion exists between the numbers provided in the options.