Question

6. How many moles of hydrochloric acid, HCl, are present in 0.085 L of a 3.0 M solution?​

Answer 1

`\huge{ \boxed{0.255 \: \text{moles}}}`

Step-by-step explanation:

To find the number of moles of a solution given it's volume and concentration/molarity, we use the formula;

`\bold{c = (n)/(v)} \\`

where

• c is the concentration/molarity in M or mol/l.
• n is the number of moles.
• v is the volume in L or dm³.

Since we're finding the number of moles, we make n the subject

`\bold{n = c * v}`

From the question;

• c = 3 M
• v = 0.085 L

`n = 3 * 0.085 = 0.255`

We have the final answer as

0.255 moles