A laboratory technician drops a 0.085 kg sample of some unknown solid, at a temperature of 100.0°C, into a calorimeter. The calorimeter can is initially at 19°C and is constructed out of 0.15 kg of copper and contains 0.200 kg of water. The final temperature of the calorimeter can and its contents (water and sample) is 26.1 °C. What is the specific heat of the sample?
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
A laboratory technician drops a 0.085 kg sample of some unknown solid, at a
temperature of 100.0°C, into a calorimeter. The calorimeter can is initially at
19°C and is constructed out of 0.15 kg of copper and contains 0.200 kg of
water. The final temperature of the calorimeter can and its contents (water
and sample) is 26.1 °C. What is the specific heat of the sample?
Hint: This seems significantly harder than the previous question, with the
addition of a third substance, but it’s not THAT different. Namely, the first step
is to realize that since the copper and water are already at equilibrium with
each other, the
+water”. So Qh=-Qc becomes Qunknown= -(Qcopper + Qwater), all variables are given
except the specific heat of “unknown” so plug in the values and solve for the
specific heat.
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