# HW chapter 10

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```					CHM 40                                       HW chapter 10                             Name
Due Thursday 1/28/10
1.      Convert the following numbers of kilojoules into kilocalories
a. 491.4 kJ
b. 24.22 kJ

2.      A 5.00 g sample of one of the substances listed in table 10.1 was heated from 25.2oC to 55.1oC, requiring
133J to do so. What substance was heated?

3.      Calculate the energy required in joules and calories to heat 29.2 g of aluminum from 27.2C to 42.5oC.
(see table 10.1 for specific heat of Al)

4.      If 100.0 J of heat energy is applied to a 25.0 g sample of mercury, by how many degrees will the
temperature of the sample of mercury increases? (see table 10.1 for specific of mercury)

5.      For the reaction
S(s) + O2(g)  SO2(g) ∆H = -296 kJ per mol of SO2 formed
a. Calculate the quantity of heat released when 1.00 g of sulfur is burned in oxygen
b. Calculate the quantity of heat released when 0.501 mole of sulfur is burned in air

6.       Ammonia reacts with oxygen according to the following equation:
4 NH3(g) + 5O2(g)  4 NO(g) + 6H2O(g)                   ΔH = - 906 kJ
Calculate the heat (in kJ) associated with the complete reaction of 155 g NH3

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