Question

Some water released 7800 J of energy when cooled from 78°C to 33°C. What was the mass of the water?

Answer 1

-41. 47

Step-by-step explanation:

m = q / Cp x T

m = Mass

q = Energy (or joules)

Cp = Heat Capacity

T = Change in Temperature

Water's heat capacity is always 4.18.

This is the formula you'll need for change in temperature:

Final - Initial

So, 33 - 78 = -45

m = 7800 / 4.18 x -45

= -41.47