0.25 moles of water (H₂O)
Explanation:
To calculate the number of moles of a particular substance we use the following formula:
number of moles = mass / molecular weight
molecular wight of water (H₂O) = number of H atoms × atomic weight of H + number of O atoms × atomic weight of O
molecular wight of water (H₂O) = 2 × 1 + 1 × 16 = 18 g/mol
number of moles of water (H₂O) = 4.5 / 18
number of moles of water (H₂O) = 0.25 moles
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