[Unit 6] Thermodynamics

The specific heats of metals are listed below.
Aluminum 0.90 J/goC
Calcium 0.62 J/goC
Molybdenum 0.28 J/goC

a) When a 45 g sample of molybdenum is heated from 21oC to 100oC, how much energy is required?

b) The following reaction is used in order to heat the molybdenum in part (a).

C3H8(g) + 5O2 -> 4H2O(g) + CO2(g) ΔH=-2220 kJ/molrxn

What mass of propane (C3H8) was burned?

c) In a separate experiment, 3.18 kJ of energy is added to 95 g of an unknown metal. The metal heats up from 21oC to 75oC. What is the identity of the metal? Justify your answer with a calculation of its specific heat.

1 Like


How do we identify the element without knowledge of specific values other than water?

Look at the question one more time… I provided you with some values at the top.

Solutions
a)

b)

c)

This corresponds to calcium’s specific heat which is listed above.

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