How many grams of NaNO3 are needed to prepare a saturated solution in 100 g of water at 40°C?

What is the force of attraction between the particles in a salt crystal

What layer of the atmosphere is directly above the troposphere?

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?