Question

How many moles of HCl are present in 40 mL of a .035 M solution?

Answer 1

Number of moles$=$ Molarity $\times$ Volume ( in Litres)

Volume $( V) = 40\ ml = \frac{40}{1000} \ L= 0.04 \ L$

Molarity $( M) = 0.35\ M$

Number of moles $=0.04\times 0.35=0.014$