Question

Convert 4.03×10^22 molecules of water to moles of water

Answer 1

A mole of water has
`6.022*10^(23)` molecules of water.

Let's mark moles of water we need to find as
`x` and make the proportion:

`(1)/(x)=(6.022*10^(23))/(4.03*10^(22))`

Now, let's express
`x` from that proportion:

`x=(1*4.03*10^(22))/(6.022*10^(23))=(4.03*10^(22))/(6.022*10^(23))=(4.03)/(6.022*10)=(4.03)/(60.22)=0.06692=6.69*10^(-2)`

So,
`<span>4.03*10^(22)` molecules of water equals to
`6.69*10^(-2)` moles of water.