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What is the mole fraction of solute and the molal concentration for an aqueous solution that is 10% NaOH by mass?

Calculate the energy of a photon emitted when a hydrogen atom under goes a transition from n=4 to n=1.

If you have a 380.0mL water at 25.00 Celsius and add 130.0mL of water at 95.00 Celsius what is the final temperature of the mixture? The density of water is 1.00 g/mL