To calculate the enthalpy of combustion of ethanol, use the equation Enthalpy change = mass of water x specific heat capacity of water x temperature change. Plugging in the given values, the enthalpy of combustion per mole of ethanol is 466,480J/mol.
To calculate the enthalpy of combustion of ethanol, we can use the equation:
Enthalpy change = mass of water x specific heat capacity of water x temperature change
In this case, the mass of water is 200g, the specific heat capacity of water is 4.2J/g/K, and the temperature change is 19.9°C. Plugging these values into the equation, we get:
Enthalpy change = 200g x 4.2J/g/K x 19.9°C = 16716J
Since 1 mole of ethanol has a molar mass of 46.07g, we can calculate the enthalpy of combustion per mole using the mass of ethanol burned:
Enthalpy of combustion per mole = Enthalpy change / moles of ethanol
moles of ethanol = mass of ethanol burned / molar mass of ethanol
= 1.65g / 46.07g/mol = 0.0358 mol
Enthalpy of combustion per mole = 16716J / 0.0358 mol
= 466,480J/mol.