Question

Density of water at room temp is 1 gm/ml how many molecules are present in a drop if its volume is 0.1 ml?

Answer 1

$\huge\green{As-Salamu-Alykum}$


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$\huge\orange{Given:-}$



Volume of water = 0.1ml


Density of water = 1g/mol



$\huge\blue{Required:- }$


Molecules of water =?


$\huge\purple{Solution:-}$


Density of water = mass/Volume


Mass = density × Volume


Mass = 1 ×0.1 = 0.1 g


Moles of water =mass / molar mass


Moles of water = 0.1/18


Moles of water = 0.005 mol



Moles of water = number of molecules /Avagadro number


Number of molecules = Moles × Avagadro number


Number of molecules = 0.005 × 6.023×10^23


Number of molecules of water = 0.033 ×10^23


Number of molecules of water = 33×10^20



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$\huge\blue{INSHALLAH IT WILL HELP U }$

Answer 2

0.036 into 10 ki power 23