Question

How many moles of HCl are there in 10 mL of a solution with a concentration of 0.5 mol L-1?

Answer 1

0.005 moles

Step-by-step explanation:

To find the number of moles of HCl in a concentrated solution, we can use the formula for molarity:
`M = (n)/(v)`, where M = molarity, n = moles of solute, and v = volume of solution in liters.

In order to plug the known values in the formula, we must first convert 10 mL to L. There are 1000 mL in a liter, so we divide 10 by 1000 to get 0.01 L of solution.

We can then rearrange the molarity formula to solve for n and then plug in the known values:

n = M × v

n = (0.5 mol/L) × (0.01 L)

n = 0.005 mol

Therefore, there are 0.005 moles of HCl in the solution.