# Enthalpy 1 (Worksheets)

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Section: _____________________________

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Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

### Q1

Using bond energies, calculate the $$\Delta H_{rxn}$$ for each of the following:

1. $$2H_{2\,(g)} + O_{2\,(g)} \rightarrow 2H_2O_{(l)}$$
2. $$CH_{4\,(g)} + 2O_{2\,(g)} \rightarrow CO_{2\,(g)} + 2H_2O_{(l)}$$

Bond type
Bond Energy, kJ/mol
Bond type
Bond Energy, kJ/mol
$$H - H$$
436
$$C - O$$
358
$$O - O$$
146
$$C = O$$
799
$$O = O$$
498
$$C - H$$
413
$$O - H$$
463