If you burn methane(CH4)and methyl alcohol(CH3OH)which gives off more heat
Luly,
This is a gcu question, right?
yes.
I am a gc monitor.
To determine which substance, methane (CH4) or methyl alcohol (CH3OH), gives off more heat when burned, we need to look at their respective heat of combustion values.
The heat of combustion is the amount of heat released when a substance undergoes complete combustion with oxygen. It is usually expressed in terms of energy per mole of the substance.
Here is the step-by-step process to find the answer:
1. Look up the molar mass of methane (CH4) and methyl alcohol (CH3OH).
- The molar mass of methane (CH4) is calculated as:
(1 x atomic mass of carbon) + (4 x atomic mass of hydrogen)
= (1 x 12.01 g/mol) + (4 x 1.01 g/mol) = 16.04 g/mol
- The molar mass of methyl alcohol (CH3OH) is calculated as:
(1 x atomic mass of carbon) + (4 x atomic mass of hydrogen) + (1 x atomic mass of oxygen)
= (1 x 12.01 g/mol) + (4 x 1.01 g/mol) + (1 x 16.00 g/mol) = 32.04 g/mol
2. Determine the balanced chemical equations for the combustion of methane and methyl alcohol.
- Methane combustion equation: CH4 + 2O2 -> CO2 + 2H2O
- Methyl alcohol combustion equation: CH3OH + 1.5O2 -> CO2 + 2H2O
3. Find the heat of combustion for both substances.
- The heat of combustion of methane is approximately -802 kJ/mol.
- The heat of combustion of methyl alcohol is approximately -726 kJ/mol.
Based on these values, we can conclude that methane (CH4) gives off more heat when burned compared to methyl alcohol (CH3OH). The heat of combustion of methane is greater than the heat of combustion of methyl alcohol.
It is important to note that these values are approximate and may vary slightly depending on the specific conditions and sources of the data.