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प्रश्न
The number of water molecules in a drop of water weighing 0.018 g is
पर्याय
6.022 × 1026
6.022 × 1023
6.022 × 1020
9.9 × 1022
उत्तर
6.022 × 1020
Explanation:
Weight of the water drop = 0.018 g
No. of moles of water in the drop = `"Mass of water"/"molar mass"`
= `0.018/18`
= 10-3 mole
No. of water molecules present in 1 mole of water = 6.022 × 1023
No. water molecules in one drop of water (10-3 mole) = 6.022 × 1023 × 10-3
= 6.022 × 1020
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