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# In the presence of excess oxygen, methane gas burns

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1. In the presence of excess oxygen, methane gas burns in a constant-pressure system to yield carbon dioxide and water:

Calculate the value of q (kJ) in this exothermic reaction when 1.70 g of methane is combusted at constant pressure.
A. -94.6
B. 0.0306
C. -0.0106
D. 32.7
E. -9.46 × 104

2. Calculate the kinetic energy in joules of an automobile weighing 2135 lb and traveling at 55 mph.

A. 1.2 × 104
B. 2.9 × 105
C. 5.9 × 105
D. 3.2 × 106
E. 3.2 × 10-6

3. The heat absorbed by a system at constant pressure is equal to &#61508;E + P&#61508;V.

4. Calculate &#61508;H0 at 25&#61616;C for the reaction below.
2ZnS(s) + 3O2(g) &#61614; 2ZnO(s) + 2SO2(g)
&#61508;H (kJ/mol) -205.6 0 -348.3 -296.8

A. -257.1 kJ
B. -879.0 kJ
C. +257.1 kJ
D. -582.2 kJ
E. +879.0 kJ

https://brainmass.com/chemistry/physical-chemistry/in-the-presence-of-excess-oxygen-methane-gas-burns-101234