The specific heat of a substance is defined as: The amount of heat required to r

Question

The specific heat of a substance is defined as: The amount of heat required to raise the temperature of any amount of substance by one degree Celsius The amount of heat required to raise the temperature of one gram of substance by one degree Celsius The amount of heat required to raise the temperature of two tons of substance by one degree Fahrenheit The amount of heat required to melt one gram of a substance The amount of heat required to vaporize one gram of a substance Using Hess's Law, calculate the Delta H_rxn for. A piece of Fe (mass = 10.0 g) at 125 degree C is placed in 25.0 mL of water at 25.0 degree C. What is the final temperature of the water? The specific heat capacity of iron = J/g degree C and water -4.18 J/g degree C.

Explanation / Answer

29. answer: B

    specificheat(s) = q/m*DT

     units = j/g.c

30.
    from the data

   ( 2S + 3O2 ----> 2SO3   DHrxn = -971 )*2

    ( SO2 ------> S + O2       dhRXN = +297)*4

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   4SO2 +2O2 ----> 4SO3 dhRXN = 2*-971+4*297 = -754 Kj
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40.
     heat lost by iron = heat gained by water

    mFe*SFe*DT = mwater*swater*DT

10*0.44*(125-T) = 25*4.18*(T-25)

T = final temperature = 29.04 C

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