Question

If 30cm³ of 0.45 mol dm3 HCl reacted with NaOH, how many moles of HCl reacted?​

Answer 1

Moles HCl reacted : 0.0135

Further explanation

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

$\large {\boxed {\bold {M ~ = ~ \dfrac {n} {V}}}$

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

n = V x M

The volume of HCl 30 cm³=3.10⁻² dm³

Molarity of HCl = 0.45 mol/dm³

so moles HCl reacted :

$\tt n=3.10^{-2}\times 0.45=0.0135$