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Chemistry
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1. The specific heat of mercury metal is 0.138J/gK. How much heat, in joules, is required to heat a 127 gram sample of mercury from -18.5oC to 107.2oC? Enter your answer in scientific notation with no units. 

2. What is the specific heat of a substance (in J/g.K) if a 52.2 gram sample of the substance increases in temperature by 17.8 when it is heated by 230.0 joules? 

3.  3C(s) + 4H2(g) + 5O2(g) ---> 3CO2(g) + 4H2O(l) ΔH= -2323.7 kJ/mol

How much heat would be released when 34.1 g of O2 react? 
Apr 19th, 2015

1.  Heat =. mass x sp. heat x delta T.

             =. 127 x 0.138 x 125.7              =.  2107.2 J

2.  sp heat = Q / m / delta t.  =.

                 = 230/(52.2) ( 17.8).            = 0.248 J /g K

3.    34.1 g of O2 = 34.1 / 32 =. 1.06.   approx.. 1 mole.

       So it would release -2323 kJ/mole/5 =. -464.6 kJ/mol


Apr 19th, 2015

I have answered your question.

Niru

Apr 19th, 2015

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