Question

The molar mass of hydrochloric acid is 36.461 g/mol. If 1.2 g of HCl are dissolved in 25ml of solution, what is the molarity?

You have 250ml of a 0.75 M lithium nitrate solution. How many moles are in it?
If you want to make a 0.25 M solution of sodium sulfate, and you use 0.75 L of water, how many moles of sodium sulfate should you add?
You have 56 mL of a 1.1 M lithium iron (II) phosphate solution. How many moles are in it?
If you want to make a 6.0 M of HCl, and you use 2.00 L of water, how many moles of HCl should you add?

Answer 1

use the formula M=n/V, where M=molarity, n=moles of solute, V= volume in litres

1.3M

0.02 mols

0.188 mols

0.062 mols

12 mols