1 mole of water are contained in the given sample of water of 18.00 grams.
Moles of any substance will be calculated as:
n = W/M, where
W = given or required mass
M = molar mass
In the question given that,
Molar mass of water H₂O = 18 g/mole
Given mass of water H₂O = 18 grams
Now we put all these values in the above equation, we get
Moles of H₂O = 18 grams / 18 g/mole = 1 mole
Hence, option (1) is correct, i.e. 1 mole of water is present.
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