Let’s say you try to get crafty. Instead of directly heating your carbontetrachloride with the Bunsen Burner, you decide it woul
d be better to drop in a hot chunk of thorium (d = 11.724 g/mL , c = 0.12 J/g*K ) metal. If you have a 29.848 g chunk of thorium, how hot (in K) must you heat the thorium in order for the chunk of metal to have enough energy to heat a 1.027 mL sample of carbontetrachloride at room temperature (298 K) to it's boiling temperature?
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Answer:
Explanation:
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In this case, since it is observed that hot cadmium is placed in cold water, we can infer that the heat released due to the cooling of cadmium is gained by the water and therefore we can write:
Thus, we insert mass, specific heat and temperatures to obtain:
In such a way, since the specific heat of cadmium and water are respectively 0.232 and 4.184 J/(g °C), we can solve for the equilibrium temperature (the final one) as shown below:
Now, we plug in to obtain:
NOTE: since the density of water is 1g/cc, we infer that 25.00 cc equals 25.00 g.
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