How many moles of solute are present in a 2 molal solution containing 250g of solvent?

Chromite ore is concentrated by:

The number of moles of $KMn{O_4}$ that will be needed to react completely with one mole of oxalate ion in acidic solution is

A 1 molal aqueous solution contains 0.5 moles of solute. What is the mass of the solvent (water) in kilograms?

The viscosity of a liquid is influenced by temperature. How does viscosity typically change with a rise in temperature?

A mixture of two volatile liquids A and B follows Raoult's law. At a certain temperature, the partial pressures of A and B above the solution are 200 mmHg and 300 mmHg respectively. If the mole fraction of A in the liquid phase is 0.4, what is the vapor pressure of pure A at this temperature?

1 gram of sodium hydroxide was reacted with $25 \mathrm{mL}$ of $0.75 \mathrm{M}$ sulfuric acid ($\mathrm{H_2SO_4}$). What mass of sodium hydroxide remains unreacted?

If we dissolve 20g of NaOH in 200ml of water, what will be the mass percentage of NaOH in the solution (assuming the density of water is 1g/ml)?

Which of the following methods is NOT typically used for concentrating a dilute ore?

Which of these is the correct formula for calculating molality?

What is the molality of a solution where the mole fraction of the solute is 0.02 and the solvent is water?