7. How much heat energy is required to raise the temperature of 789 grams of acetic acid, CH3COOH, from 25.0°C to 82.7 °C? The Cp of acetic acid is 2.05 J/g °C.
(Number 7)

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.