1.) An unknown fluid, in a perfectly insulated container, experiences a 30oF cha
ID: 1366500 • Letter: 1
Question
1.) An unknown fluid, in a perfectly insulated container, experiences a 30oF change in temperature after 400 BTUs of heat energy is added to the system. If the mass of the fluid is 25.0 kg, what is the specific heat (BTU/lb/oF) of this fluid?
2.) A 2 kg block of ice (specific gravity of 0.92) is placed in an insulated tub containing 175 L of water at 90 C. Assuming the tub is insulated (no heat gain or loss), what is the equilibrium temperature (C) of the system at steady state?
3.) Assume 2,000 kJ of heat energy is removed from a liquid-based system (25.0 kg of liquid with a specific heat of 4.75 J/g/C). At the end of a 12 C cooling process all of liquid has just changed to a solid. Once the liquid has solidified, the system is in thermal equilibrium (no temperature change in the solid). What is the latent heat of fusion (kJ/kg) of the unknown liquid?
Explanation / Answer
As per guide lines I am working first question only
formula for specific heat is
Q = mc del T
c = Q/ mc del T
= 400 BTU/25 kg (2.20462262185 lb/ kg) 30 F
=0.241 BTU/lb/oF
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