If the heat of combustion for a specific compound is -1080.0 kJ/mol and its molar mass is 58.29 g/mol, how many grams of this compound must you burn to release 300.60kJ of heat?
1080 kJ/mol x # mols = 300.6 kJ
Solve for # mols, then n = grams/molar mass. You know molar mass and n, solve for grams.
To find out how many grams of the compound you need to burn to release 300.60 kJ of heat, you can use the equation:
q = n * ΔH
where q is the heat released (in kJ), n is the number of moles of the compound burned, and ΔH is the heat of combustion (in kJ/mol).
We can rearrange the equation to solve for n:
n = q / ΔH
Now, let's substitute the given values:
n = 300.60 kJ / -1080.0 kJ/mol
n = -0.278 mol
Since we know the molar mass of the compound is 58.29 g/mol, we can calculate the mass of the compound using the formula:
mass = n * molar mass
mass = -0.278 mol * 58.29 g/mol
mass = -16.17 g
Note that the negative sign indicates that the mass is not physically meaningful in this context. Therefore, the answer is that you can't burn a negative mass of a compound, so it's not possible to release 300.60 kJ of heat using the given compound.