Scelta multipla
Given that the specific heat capacity of water is 4.18 J/g·°C, how many grams of water can be heated from 20.0 °C to 75.0 °C using 12,500.0 joules of energy?
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8. Thermochemistry
Heat Capacity
Scelta multipla
If 0.145 J of heat causes a temperature change of 0.475 °C in a substance, what is the heat capacity of the substance?
A
0.475 J/°C
B
0.690 J/°C
C
0.305 J/°C
D
0.145 J/°C
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Understand that heat capacity (C) is defined as the amount of heat (q) required to change the temperature (ΔT) of a substance by one degree Celsius. The formula is:
\[ C = \frac{q}{\Delta T} \]
Identify the given values from the problem: heat added, \(q = 0.145\) J, and temperature change, \(\Delta T = 0.475\) °C.
Substitute the known values into the heat capacity formula:
\[ C = \frac{0.145\ \text{J}}{0.475\ ^\circ\text{C}} \]
Perform the division to find the heat capacity, which will have units of J/°C, indicating how much heat is needed to raise the temperature by one degree Celsius.
Interpret the result as the heat capacity of the substance, which tells you how much energy is required to change its temperature by a certain amount.
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