Isooctane C8H18 is a major component of gasoline. Determine the change in enthalpy for the combustion of 2.000 mol of isooctane from the following data:

H2( g) + (1/2)O2 (g) ⟶ H2O(g) ΔH0 = −241.8 kJ
C (s) + O2 (g)⟶ CO2 (g) ΔH0 = −393.5 kJ
8C (s) + 9H2 (g) ⟶ C8H18 (l) ΔH0 = −224.13 kJ

Choices:

−5548 kJ

-89.43 kJ

−10200 kJ

−2550 kJ

-411.2 kJ

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.