Determine the heat of combustion of acetylene (C2H2).
To determine the heat of combustion of acetylene (C2H2), you'll need to follow a few steps:
1. Write the balanced equation for the combustion of acetylene:
C2H2 + O2 -> CO2 + H2O
2. Find the molar masses of the compounds involved:
The molar mass of C2H2 (acetylene) is 26 g/mol.
The molar mass of CO2 (carbon dioxide) is 44 g/mol.
The molar mass of H2O (water) is 18 g/mol.
3. Calculate the difference in molar mass between the reactants and products:
Change in molar mass = (2 mol of CO2 * 44 g/mol) + (2 mol of H2O * 18 g/mol) - (1 mol of C2H2 * 26 g/mol)
Change in molar mass = 88 g/mol + 36 g/mol - 26 g/mol
Change in molar mass = 98 g/mol
4. Determine the heat of combustion using the equation:
Heat of combustion = Energy released/change in molar mass
Heat of combustion = Energy released/98 g/mol
The value you get for the heat of combustion will depend on the specific units used for energy released (e.g., joules or calories) and the specific value of the energy released (which can be obtained from experimental data or reference sources).