What is the molarity of formaldehyde in a solution containing 0.25 g of formaldehyde (CH₂O) per mL?

Question

Quizplus · Accepted Answer

To calculate molarity (M), we need to know the number of moles of solute (n) and volume of solution (V) in liters.

First, we need to calculate the number of moles of formaldehyde in 1 mL of solution:

Number of moles = mass in grams / molar mass
Molar mass of formaldehyde (CH2O) = 12.01 + 2(1.01) + 16.00 = 30.03 g/mol

Number of moles = 0.25 g / 30.03 g/mol = 0.00833 mol

Since the volume of solution is given as 1 mL, we have:

V = 1 mL / 1000 mL/L = 0.001 L

Now we can calculate the molarity:

Molarity = moles / volume
Molarity = 0.00833 mol / 0.001 L = 8.3 M

Therefore, the answer is C.

What Is the Molarity of Formaldehyde in a Solution Containing