Asample of pure solid naphthalene (c10h8) weighing 0.6410 g is burned completely with oxygen to co2(g) and in a constant-volume calorimeter at 25°c. the amount of heat evolved is observed to be 25.79 kj.
write and balance the chemical equation for the combustion reaction.

C10H8 + 12O2 > 10CO2 + 4H2O

Explanation:

To balance this, we have to make sure that the same number of atoms exist at both sides (Conservation of energy)

Note:The reaction is exothermic, giving off heat energy.

Left hand side: C= 10,

H=8,

O= 2×12=24

Right hand side: C= 10×1=10,

H= 4×2=8,

O=10×2=20 (for 10CO2) and 4×1=4 (All equal to 24)

With the above analysis, it is clear that numbers had to be added to molecules to get an equal number of atoms for both sides.

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explanation:

answer: h+ its less than oh

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