5.50 g HCL is needed.

How many mL of 2.25 M HCL should be used

H=1 amu, CL = 35.5 amu

I get, amu atomic mass units gives the molar mass. I also get 2.25 M represents Mol/Liter,

However I don't know how to get from 2.25 M to mL.

I am more worried about the steps than the numbers if you feel like using your own numbers feel free.

## Answers (1)

first, find out how many moles of HCl that 5.50 grams represents.

Then you know that each litre of acid contains 2.25 moles

SO, for example, if you need 1.66 moles, you'll need 1.66/2.25 litres = 0.738 litres = 738 cm3

If you need 0.85 moles, you'd find it in 0.85/2.25 = 0.378 litres = 378 cm3

number of moles = concentration x volume, so

volume = number of moles/concentration

just be sure to convert litres to milli litres. 1000 cm3 = 1000 ml = 1 litre = 1 dm3