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A. 3.8 g of water
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B. 4.8 g of C2H5OH
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C. 2.8 g of CO
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D. 5.4 g of N2
Explanation
The substance with the most moles is 3.8 g of H2O (0.211 moles).
Therefore, it has the largest number of molecules.
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A. Always more than 1
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B. Always 1
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C. Always less than 1
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D. May be less or more than 1
Explanation
In any mixture of gases, the sum of the mole fractions of all components is always equal to 1.
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