A sample of solid aluminum is heated with an electrical coil If 246 Joules of en

Question

A sample of solid aluminum is heated with an electrical coil If 246 Joules of energy are added to a 14.0 gram sample and the final temperature is 39.8 degree C what is the final temperature of the aluminum? Answer A sample of solid magnesium is heated with an electrical coil If 221 Joules of energy are added to a 12.2 gram sample initially at 22.0 degree C, what is the final temperature of the magnesium A sample of gaseous xenon is heated with an electrical coil If 26.3 Joules of energy are added to a 10.8 gram sample and the final temperature IS 38.8 degree C, what is the initial temperature of the xenon? Answer: degree C

Explanation / Answer

1) energy req to rise temp of Al = mCpdT   (Cp = 0.90 for Al)

246 = 14* 0.900*(39.8-T)

   T=20.27 C == >20.3C

2)  energy req to dec temp of solid magnesium =mCpdT    (Cp = 1.01 for solid Mg )

221= 12.2*1.01*(T-22)

   T=39.8C

3) energy req to dec temp of gaseous xenon =mCpdT   (Cp = 0.158 fo gaseous xenon)

26.3 = 10.8*0.158*(38.8-T)

T=23.38C= 23.4C

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