Question

A solution of ammonia is made by dissolving 35 g of NH3 in 90.0 g of H2O. The density of the solution is 0.898 g/mL. Calculate the Molarity, Molality, Mass percent and mole fraction of Ammonia in this solution.

Answer 1

To solve the student's problem, we would calculate the molarity by obtaining the moles of NH3 divided by the volume of the solution, the molality by dividing the moles of NH3 by the mass of H2O in kg, the mass percent by dividing the mass of NH3 by the total mass of solution times 100, and the mole fraction by dividing the moles of NH3 by the total moles of the solution.

Step-by-step explanation:

To calculate the molarity, molality, mass percent, and mole fraction of ammonia in the solution, we need to use certain formulae and the provided information. Here's how we can do it step-by-step:

• Molarity (M) is calculated as moles of solute per liter of solution. We'll first find the moles of NH3 and then divide by the total volume.
• Molality (m) is calculated as moles of solute per kilogram of solvent. We divide the moles of NH3 by the mass of water (in kg).
• Mass percent is calculated as the mass of the solute divided by the total mass of the solution, multiplied by 100.
• Mole fraction of NH3 is the ratio of moles of NH3 to the total moles of all components.

Since not all required data (like the volume of the solution for molarity) are provided, not all calculations can be completed. Nevertheless, the molality and mole fraction can be calculated with available data.