Question

14. How many molecules of water are present in a drop of water which has a mass of
50mg?
Please answer this question correctly. Best answer will be chosen as brainliest.​

Answer 1

Answer:

1.27

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Answer 2

Answer:-

1.67×10²¹ molecules

Explanation:-

Given:-

→Mass of the drop of water = 50mg

To find:-

→Number of molecules present in a drop of water which has a mass of 50mg.

Solution:-

•Chemical formula of water = H₂O

Molar mass of water:-

= 1×2+16

= 18g

Now, let's convert the given mass from mg to g.

=> 1mg = 0.001g

=> 50mg = 50×0.001

=> 0.05g

Number of moles in 0.05g of water:-

No of moles = Given mass/Molar mass

= 0.05/18 moles

•Avogadro number = 6.022×10²³

Number of molecules:-

= No of moles×Avogadro Number

= 6.022×10²³×0.05/18

= 0.3011×10²³/18

= 0.0167×10²³

= 1.67×10²¹ molecules

Thus, 1.67×10²¹ molecules are there .