Question

How many moles of HCl are in 30.00mL of a 0.1000M HCl solution? A. 0.003000mol. B. 300.0mol C. 0.03000mol D. 3.000mol

Answer 1

Given the volume of HCl solution = 30.00 mL

Molarity of HCl solution = 0.1000 M

Molarity, moles and volume are related by the equation:

Molarity =
`(Moles of solute)/(Volume of solution (L))`

Converting volume of HCl from mL to L:

`30.00 mL * (1 L)/(1000mL)=0.030000 L`

Calculating moles of HCl from volume in L and molarity:

`0.03000 L * (0.1000mol)/(L)= 0.003000 mol HCl`

The final moles would be reported to 4 sig figs. So the correct answer will be 0.03000 mol HCl

Correct option: C. 0.03000mol