Question

How many mol3cules of h2o are present in 9 ml of h2o?

Answer 1

we have molecular mass of water 9H2O=1×2+16×9=162gm

1molecule of water = moleculer mass in gm= 162

no.of molecules =no. of moles ×avogadro's no.

no. of moles =given mass/molecular mass

mass=9ml=9gm. 9/162moles

And so no. of molecules = no. of moles ×avogadro's no. in 9ml

water

=9/162×6.022×1023

=342.25

therefore 342.25no.of molecules present in 9ml of water