Considering the definition of molar mass, the correct answer is option a) 1 mole of water is contained in the sample.
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Therefore, knowing the molar mass, the number of moles in a container can be calculated using the expression: [tex]mol=\frac{mass}{molar mass} [/tex]
In this case, you know that the molar mass of water (H₂O) is 18.0 [tex]\frac{g}{mole} [/tex].
A sample of water has a mass of 18.0 g. So, the number of moles in the sample can be calculated as:
[tex]mol=\frac{18 g}{18\frac{g}{mole} } [/tex]
Solving:
mol= 1
Finally, the correct answer is option a) 1 mole of water is contained in the sample.
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