A213g hot tub in the winter has a temperature of 42℃ at 9pm. all heating is turned off. the next morning the hot tub water has a temperature of 22℃. how much energy is required to bring the temperature back to 42℃? with a ! 6 by 6

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17832.36 J of energy is required to bring the temperature back to 42℃

Explanation: -

Mass of water = 213 g

Initial temperature = 22 °C

Final temperature = 42 °C

Change in temperature ΔT = Final temperature - Initial Temperature

                                        = 42 °C - 22 °C

                                        = 20 °C

Specific Heat for water c = 4.186 J / g °C

Heat energy required = m x c x ΔT

                                     = 213 g x 4.186 J / g °C x 20 °C

                                    = 17832.36 J

Thus 17832.36 J of energy is required to bring the temperature back to 42℃

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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