Chemistry, asked by beingaakarshroutray, 11 months ago

Density of water at room temperature is 1g/ml. How many molecules are there in a drop of water if its volume is 0.05 ml?​

Answers

Answered by Arcel
2

1.68 x 10^21 Molecules

Given:

Volume of drop of water = 0.05 mL

Density of water at room temperature = 1 g/ml

To Find:

Amount of molecules that is there in a drop of water.

Calculating:

Formula used to calculate the mass of drop of water

= Volume x Density

Calculating the mass of water by substituting the values known to us in this formula:

= 0.05 ml x 1 g/ml

= 0.05 grams

Calculating the molecular mass of water:

(H2O)

= 1 x 2 + 16 x 1

= 2 + 16

= 18 grams

1 mole of water is equal to 18 grams

By knowing this we can tell for 0.05 grams of water:

=  1 mol / 18 grams x 0.05 grams

= 0.0028 mol

Calculating the number of molecules present:

1 mole = 6.022 x 10^23

From this we can get to know number of molecules 0.0028 moles of water contain:

= 6.022 x 10^23 x 0.0028

= 1.68 x 10^21 molecules

Therefore, there are 1.68 x 10^21 molecules in a drop of water if its volume is 0.05 mL.

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