Question

Hydrochloric acid is widely used as a laboratory reagent, in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCI in 62.85 mL of 0.453 M hydrochloric acid.

1) 28.5 mol
2) 1.04 mol
3) 0.139 mol
4) 0.0285 mol
5) 0.00721 mol

Answer 1

Option 4

Step-by-step explanation:

Hydrochloric acid is a strong one, that gives protons to medium. It can be dissociated as this:

HCl → H⁺ + Cl⁻

M means Molarity. It is a sort of concentration that indicates the moles of solute in 1L of solution.

M = moles / volume (L)

We can also say M = mmoles / mL of solution

M . mL = mmoles

0.453 M . 62.85mL = 28.5 mmoles

If we divide by 1000 → 28.5 mmol . 1 mol / 1000 mmol = 0.0285