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Question
Which one of the following represents 180 g of water?
Options
5 Moles of water
90 moles of water
`(6.022 xx 10^23)/180` molecules of water
6.022 × 1024 molecules of water
Solution
6.022 × 1024 molecules of water
Explanation:
No. of moles of water present in 180 g
= `"Mass of water"/"Molar mass of water"`
= `(180 "g")/(18 "g mol"^-1)`
= 10 moles
One mole of water contains = 6.022 × 1023 water molecules
10 mole of water contains = 6.022 × 1023 × 10
= 6.022 × 1024 water molecules
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