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The molar mass of water [tex] \left( H_2O \right) [/tex] is [tex] 18.0 \, \text{g/mol} [/tex]. A sample of water has a mass of [tex] 18.0 \, \text{g} [/tex]. How many moles of water are contained in this sample?

A. 1.00 mole
B. 18.0 moles
C. 36.0 moles
D. 324 moles

Sagot :

GinnyAnswer
To determine the number of moles of water in a sample, you can use the formula:

[tex]\[ \text{moles} = \frac{\text{mass of the sample}}{\text{molar mass}} \][/tex]

Given:
- The mass of the water sample is [tex]\(18.0 \text{ g}\)[/tex].
- The molar mass of water ([tex]\(H_2O\)[/tex]) is [tex]\(18.0 \text{ g/mol}\)[/tex].

Next, plug the given values into the formula:

[tex]\[ \text{moles of water} = \frac{18.0 \text{ g}}{18.0 \text{ g/mol}} \][/tex]

Performing the division:

[tex]\[ \text{moles of water} = 1.0 \text{ mole} \][/tex]

Hence, there are [tex]\(1.0\)[/tex] mole of water in the [tex]\(18.0 \text{ g}\)[/tex] sample.

The correct answer is:

[tex]\[ 1.00 \text{ mole} \][/tex]
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