Question

How many water molecules are present in 2
mL of water (d = 1 g/mL)?

Answer 1

Answer:

, we have molecular mass of water H2O

= 1x2 + 16 = 18 gm

Since, 1 mol water = molecular mass

in gm = 18gm.

As no. of molecules = no. of moles x

avogadro's no.

And No. of moles = given mass/

molecular mass.

Here, given mass = 1ml= 1gm

Thus, no. of moles of water in 1 ml =

1/18 mol.

And so No. of molecules in 1ml water

= no. of moles x avogadro's no. = 1/18  X 6.022 x 1023 =0.33 x

1023 molecules

So, the no. of molecules of water in

1ml of water = 3.3 x 1022

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Explanation:

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