How many moles of HCl are present in a 0.0250 L solution?

Answer 1

1. First, remember definition of M (moles), M = moles of species / L.

0.33 M = 0.33 moles HCl / L

2. Then, multiple your volume by the molar concentration:

0.33 moles HCl / L x 0.70 L = 0.231 moles HCl or you can say n=CONCENTRATION multiply by VOLUME(HCl) which gives 2310 mol HCl

It's helpful to carry the units with your calculations. That way you can check that numerators and denominators cancel to give you the units of your answer.

Answer 2

Molarity = moles of solute/liters of solution

or, for our specific purpose here

moles of solute (HCl) = liters of solution * Molarity

10 ml = 0.01 liters

moles of solute (HCl) = (0.01 liters)*(0.1 M HCl)

= 0.001 moles of HCl

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Answer 3

moles = mass (g) / molar mass (g/mol)

So: 1.0 (g HCl) / 36.5 (g/mol HCl) = 0.027 mole HCl

Answer 4

That depends on the concentration (molarity) HCl, which is missing here.

Answer 5

0.03000 L x 1.000 mol/L = 0.03000 moles

Answer 6

0.23 mol

Answer 7

0.035mol