im stuck on finding the molarity of a substance and its due tomarrow. someone please help. 5 moles of HCI in two liters. 2 moles of NaOH in 1 liter. 0.5 moles of HCI in one liter. 36 grams of HCI in one liter.
thanx,
alex
just divide the number of moles by the number of liters
anna
thanks anna. i figured it out thanx 2 u.
To find the molarity (M) of a substance, you need to divide the moles of the solute by the volume of the solvent in liters. Let's calculate the molarity for each of the given examples:
Example 1:
5 moles of HCl in 2 liters.
Molarity (M) = moles/volume
Molarity = 5 moles / 2 liters
Molarity = 2.5 M
So, the molarity of this solution is 2.5 M.
Example 2:
2 moles of NaOH in 1 liter.
Molarity (M) = moles/volume
Molarity = 2 moles / 1 liter
Molarity = 2 M
The molarity of this solution is 2 M.
Example 3:
0.5 moles of HCl in 1 liter.
Molarity (M) = moles/volume
Molarity = 0.5 moles / 1 liter
Molarity = 0.5 M
The molarity of this solution is 0.5 M.
Example 4:
36 grams of HCl in 1 liter.
First, we need to convert grams to moles using the molar mass of HCl (36.5 g/mol).
Moles = grams / molar mass
Moles = 36 g / 36.5 g/mol
Moles = 0.986 moles
Molarity (M) = moles/volume
Molarity = 0.986 moles / 1 liter
Molarity = 0.986 M
The molarity of this solution is 0.986 M.
Remember, when calculating molarity, you divide the moles of solute by the volume of the solvent in liters.