Enthalpy of combustion of c(graphite)is _393.3 KJ mol -1then for producing 39.3 KJ of heat the amount of carbon required is
You get 393.5 kJ for 12 g C. You want 39.3 kJ; therefore,
(393.5 kJ/12 g C) x #g C = 39.3 kJ.
Solve for #g C.
To determine the amount of carbon required to produce 39.3 kJ of heat, we need to use the enthalpy of combustion of carbon (graphite).
The enthalpy of combustion refers to the energy released when one mole of a substance undergoes complete combustion. In this case, the enthalpy of combustion of carbon (graphite) is given as -393.3 kJ/mol.
To find the amount of carbon required to produce a specific amount of heat (39.3 kJ), we can set up a proportion using the enthalpy values:
-393.3 kJ/mol = x kJ/mol
39.3 kJ = 1 mol
Now, we can solve for x (the amount of carbon in moles) by cross-multiplying:
-393.3 kJ = 39.3 kJ * x mol
-393.3 kJ = 39.3 mol * kJ
-393.3/39.3 = x mol
-10 = x mol
Therefore, the amount of carbon required to produce 39.3 kJ of heat is approximately -10 moles. However, it's important to note that a negative value for moles doesn't make physical sense, indicating a discrepancy in the calculation or data. Please double-check your values and make sure they are correct.