Mole fraction of A in H2O is 0.2. The molality of A in H2O is

To find the molality of A in H2O, we need to follow these steps:

Step 1: Understand the given information. We are given that the mole fraction of A in H2O is 0.2.

Step 2: Recall the definition of mole fraction. The mole fraction of a component in a solution is the ratio of the number of moles of that component to the total number of moles in the solution.

Step 3: Use the mole fraction formula. The mole fraction of A in H2O can be calculated using the formula: Mole fraction of A = moles of A / total moles of solution

Step 4: Rearrange the formula to solve for moles of A. moles of A = Mole fraction of A * total moles of solution

Step 5: Determine the total moles of solution. The total moles of solution can be calculated using the formula: Total moles of solution = moles of A + moles of solvent

Step 6: Calculate the molality of A. The molality of A is defined as the moles of solute per kilogram of solvent. It can be calculated using the formula: Molality of A = moles of A / mass of solvent (in kg)

Step 7: Substitute the values into the formula. Substitute the calculated moles of A and the mass of the solvent into the formula to find the molality of A in H2O.

By following these steps, you can determine the molality of A in H2O.