Question

Calculate the no of molecules in 1 drop of water weighing 0.048g

Answer 1

Explanation:

exact value of the mass of water ie 18.016 isn't taken so ans may vary

Answer 2

Answer:

Explanation:

Molecules:

One or more atoms make up molecules. They may have the same atoms (for example, an oxygen molecule has two oxygen atoms) or different atoms if they have more than one (a water molecule has two hydrogen atoms and one oxygen atom). Numerous thousands of atoms can be found in biological compounds like DNA and proteins.

Given:

One drop of water weighing $0.048g$.

Find:

To calculate number of molecules.

Solution:

The gram molecular mass of water $=18.016 \mathrm{~g}$

This mass contains $6.022 \times 10^{23}$ molecules.

The number of molecules contained in $0.048 \mathrm{~g}=\frac{6.022 \times 10^{23}}{18.016} \times 0.048=1.604 \times 10^{21}$

Hence, one drop of water contains $1.604 \times 10^{21}$ molecules.

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