What is the molarity of a solution containing 20 grams of NaOH in 500 milliliters of solution?
a-0.04M
b-0.5M
c-1M
d-2M
1M
C-1M
I M
To find the molarity of a solution, you need to calculate the number of moles of the solute (NaOH) and divide it by the volume of the solution in liters.
Step 1: Convert the mass of NaOH from grams to moles.
The molar mass of NaOH is 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.00 g/mol.
20 grams of NaOH is equivalent to 20 g / 39.00 g/mol = 0.513 moles.
Step 2: Convert the volume of the solution from milliliters to liters.
500 milliliters of solution is equivalent to 500 mL / 1000 mL/L = 0.5 liters.
Step 3: Calculate the molarity.
Molarity (M) = Moles of solute / Volume of solution (in liters)
Molarity = 0.513 moles / 0.5 liters = 1.026 M.
Therefore, the molarity of the solution is approximately 1M.
Answer: c-1M
mols = grams/molar mass
Molarity = mols/L of solution