Question

Calculate the molarity of 2.20 kg of formaldehyde H₂CO in 5.50 L of solution (solution used to fix tissue samples).

a) 0.2 M
b) 0.4 M
c) 0.6 M
d) 0.8 M

Answer 1

To calculate the molarity of the solution, divide the number of moles by the volume of the solution in liters.

Step-by-step explanation:

To calculate the molarity of the solution, we need to first determine the number of moles of formaldehyde (H₂CO) in 2.20 kg. The molar mass of H₂CO is 30.03 g/mol. Therefore, the number of moles is calculated as:

Number of moles = mass / molar mass

Number of moles = 2.20 kg / 30.03 g/mol = 73.22 moles

Next, we divide the number of moles by the volume of the solution in liters to obtain the molarity:

Molarity = number of moles / volume of solution

Molarity = 73.22 moles / 5.50 L = 13.31 M

Therefore, the molarity of the solution is 13.31 M. Since none of the given answer options match, the correct answer would not be one of the provided choices.