Question

1. How many joules of heat is needed to heat 68.00 grams of aluminum foil from 55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C?

2. Which of the following equations is an exothermic reaction?

Answer 1

7. C. 2326 J

8. B

Step-by-step explanation:

7. Use the equation q=m*c* change in temp, where m is mass, c is specific heat capacity.

q= 68 g* (0.9 J/g*c) * (93-55) C

q= 2326 J

8. An exothermic reaction is characterized by a negative delta H (change in enthalpy) since energy is released during the reaction. B is the only choice with a negative delta H.