67) This question asks us the amount of heat needed to raise the temperature of a liquid. Since it is told that the substance starts and ends as a liquid, we can deduce that there is no phase change in this process. As a result, we will use the specific heat equation.
The specific heat is the amount of heat required to raise 1 kilogram of a substance by 1 °Kelvin. So to raise m kilograms of a substance by T °Kelvin, we come up with the following equation.
We are given the initial and final temperatures respectively as 10 °C and 30 °C. In most situations, we use temperature in Kelvin; however, since we are only concerned with the change in temperature, it is fine to use Celcius.
We are given mass(m), specific heat(c), and initial and final temperatures(T), so we can plug these values into our above equation.
Answer: E
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