Question

How many moles of isooctane must be burned to produce 100 kJ of heat under standard state conditions? Show all your work.

Answer 1

Question #62996, Chemistry / Other

How many moles of isooctane must be burned to produce 100 kJ of heat under standard state conditions? Show all your work.

Solution:

Standard enthalpy of combustion is $-5460.0\ \mathrm{kJ\ mol^{-1}}$

$$2C_8H_{18} + 25O_2 \rightarrow 16CO_2 + 18H_2O + 5460.0\ \mathrm{kJ}$$ $$n = \frac{100\ \mathrm{kJ} \times 2\ \mathrm{mol}}{5460\ \mathrm{kJ}} = 0.037\ \mathrm{mol}$$

Answer:

0.037 mol

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