Hello dear student
1 mole of water weighs = the molecular mass of water.
thus the amount of present in 0.25 mole of it is 4.5 grams
So ans a. 4.5 gm
or
mass of water - 0.25 mol
We know molecular mass of water ( M) = 18
No. Of grams ( W) ?
No. Of moles = W/M
W= No of moles × M
W = 0.25 × 18
W= 4.5 gm
hope that's helpful
best of luck
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