Question

2.7g of formaldehy de (CH²O) is dissolved and 3.25moles of C tetrachloride (CCl 4) calculate the mole fraction of formaldehy de

Answer 1

To find the mole fraction of formaldehyde (CH2O) in a solution, divide the moles of CH2O by the total moles of solutes. Given 2.7g of CH2O dissolved in 3.25 moles of CCl4, we can find the mole fraction to be 0.0273.

Step-by-step explanation:

To calculate the mole fraction of formaldehyde (CH2O) in a solution, we need to first determine the moles of formaldehyde and moles of all solutes present in the solution. Then, we can divide the moles of formaldehyde by the total moles of solutes.

Given that 2.7g of formaldehyde is dissolved in 3.25 moles of C tetrachloride (CCl4), we can calculate the moles of CH2O by dividing its mass by its molar mass.

Molar mass of CH2O = 12.01g/mol + 1.01g/mol + 16.00g/mol = 30.03g/mol

Moles of CH2O = (2.7g) / (30.03g/mol) = 0.0899 mol

Now, we can calculate the mole fraction of CH2O using the formula:

Mole fraction of CH2O = (moles of CH2O) / (moles of CH2O + moles of CCl4)

Mole fraction of CH2O = (0.0899 mol) / (0.0899 mol + 3.25 mol) = 0.0273