Question 7.CC.11: How many kilojoules are released when 3.50 g of CH4 undergoe......
Example: How many kilojoules are released when 3.50 g of CH _4 undergoes combustion?
CH _4(g)+2 O _2(g) \stackrel{\Delta}{\longrightarrow} CO _2(g)+2 H _2 O ( g ) \quad \Delta H=-802 kJ
Step-by-Step
\underset{\text{Three SFs}}{3.50\ \cancel{g\ CH_4}}\times\underset{\text{Four SFs}}{\overset{\text{Exact}}{\frac{1\ \cancel{mole\ CH_4}}{16.04\ \cancel{g\ CH_4}}}}\times\underset{\text{Exact}}{\overset{\text{Three SFs}}{\frac{-802\ kJ}{1\ \cancel{mole\ CH_4}}}}=\underset{\text{Three SFs}}{-175\ kJ}
Therefore 175 kJ are released.
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