Question

How many moles of NaOH are present in 18.5 ml of 0.130 M NaOH?

Answer 1

We can solve this by the unitary method.

Explanation:

0.130 moles are present in 1000 mL (1L) of solution.

`color(white)(wwwwww` `"1000 mL = 0.130 moles"`
`color(white)(wwwiwwwww` `"1 mL" = 0.130/1000 " moles"`
`color(white)(wiwwwww` `"18.5 mL" = 0.130/1000 xx 18.5" moles"`
`color(white)(wwwwwwwwwww` `= 13 xx 18.5 xx 10^(-5) " moles"`
`color(white)(wwwwwwwwwww` `= 2.41 xx 10^(-3) " moles"`

I hope you got this!