Question

What will be the no. of molecules in 1 ml of water?

Answer 1

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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