# When 0.0700 mol of a substance is added to 150.0 grams of an aqueous solution in...

###### Question:

When 0.0700 mol of a substance is added to 150.0 grams of an aqueous solution in a Styrofoam cup calorimeter, a chemical reaction occurs that causes the temperature of the solution to increase from 25.3 to 38.3 °C. Assume that the specific heat of the solution is 4.18 J/(g°C) and that the heat capacity of the calorimeter is negligible. Use this data to calculate the enthalpy change (in kJ/mol substance) for the chemical reaction +116 kJ/mol +3.80 kJ/mol -571 kJ/mol - 116 kJ/mol +571 kJ/mol
Question 22 Which of the following is a true statement about exothermic reactions? Reactants are lower in potential energy than products. All of these are true. The temperature of the surroundings decreases. AH is a positive value. Heat is released by the reaction and transferred to the surroundings.

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