Final answer:
To calculate the molality of a solution, you need to know the mass of the solute and the mass of the solvent. Molality is defined as the number of moles of solute per kilogram of solvent. Let's go through the calculations for each of the given solutions.
Step-by-step explanation:
In order to calculate the molality of a solution, you need to know the mass of the solute and the mass of the solvent. Molality is defined as the number of moles of solute per kilogram of solvent. Let's go through the calculations for each of the given solutions:
- For solution (a), the mass of Na2CO3 is 0.710 kg and the mass of water is 10.0 kg. Thus, the molality is equal to the moles of Na2CO3 divided by the mass of water in kilograms.
- For solution (b), the mass of NH4NO3 is 125 g and the mass of water is 275 g. Again, the molality is calculated by dividing the moles of NH4NO3 by the mass of water in kilograms.
- For solution (c), the mass of Cl2 is 25 g and the mass of CH2Cl2 is 125 g. The molality is obtained by dividing the moles of Cl2 by the mass of CH2Cl2 in kilograms.
- For solution (d), the mass of tetrahydropyridine is 0.372 g and the mass of CHCl3 is 125 g. The same process is used to calculate the molality.