A student places 125g of liquid water, H201), at 24 °C into a coffee-cup calorimeter, and then adds 10.5g of solid potassium bromide, KBr (s), and 1.6mol of unknown substance, also at 24°C. He stirs the liquid until the potassium bromide and unknown substance fully dissolve, and then determines that the temperature has changed to 19 °C. KBr and unknown substance do not react with each other. of potassium We know that molar enthalpy change for dissolution reaction, AH bromide is 18357J/mol. Calculate the molar enthalpy change for the dissolution reaction of unknown substance, AH `sol · Assume that the specific heat capacity, c, of the liquid in the coffee-cup calorimeter is the same as the specific heat capacity of water, 4.18J/(g°C). sol Hint: 4system 1 + 9system 2 -ąsurrounding Isurrounding = mcAT ΔΗ' -n ΔΗ sol

at a certain temperature,1.85 grams of barium hydroxide will dissolve to form 100.0 ml of a saturated barium hydroxide solution. the molar mass barium hydroxide is 171.34 grams/mole. what is the concentration of the solution in unit molarity? what is the constitution of the hydroxide ion in the same solution?

5.00 g of solid Al(NO3)3 was added to enough water to make a solution with a total volume of 100.0 mL.  Al(NO3)3 is very soluble in water and this much solid will fully dissolve in a 100.0 mL solution.  If 65 mL of water was added to the original 100.0 mL Al(NO3)3 solution described to the left in order to dilute the solution.  Calculate the new diluted solution concentration, in Molarity? Assume the volumes of the 2 solutions are additive.

The solubility of an ionic solid is 122.7g/100g of water at room temperature. What is the maximum amount of ionic solid that will dissolve in 94.79g of water at this temperature?