Question:
What is the mass in grams of $0.25 \text{ mol}$ water?
What is the mass in grams of $0.25 \text{ mol}$ water?
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Multiplying by 0.25 is the same as dividing by 4. So, $18 / 4 = 4.5$.
Updated On: May 14, 2026
- $1.5 \text{ g}$
- $2.5 \text{ g}$
- $4.5 \text{ g}$
- $3.5 \text{ g}$
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The Correct Option is C
Solution and Explanation
Step 1: Concept
The mass of a substance is calculated by multiplying the number of moles by its molar mass.
Step 2: Meaning
The chemical formula for water is $\text{H}_2\text{O}$. The molar mass is $2(1.0) + 16.0 = 18 \text{ g/mol}$.
Step 3: Analysis
Given moles $= 0.25 \text{ mol}$. $\text{Mass} = \text{moles} \times \text{molar mass} = 0.25 \times 18$.
Step 4: Conclusion
$0.25 \times 18 = 4.5 \text{ g}$. Final Answer: (C)
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