12th question solve......
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No. of drops in 2 ml = 35
Mass of 2 ml = 2 x 1.2 = 2.4 g
Mass of each drop = 2.4 / 35 = 0.07 appx
Moles of liquid in each drop = 0.07/70 = 1 x 10^-3
No. of molecules in each drop = 1 x 10 ^-3 x 6.023 x 10^23 = 6.023 x 10 ^20
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