What is the heat required to vaporize 650 grams of a liquid with a heat of vaporization of 723 joules/gram?

469,950 J

Explanation:

Vaporization heat is the amount of heat energy needed to vaporize an amount of substance at a constant temperature, this is to change the liquid into gas phase. The temperature remains constant during the change of phase because the energy is being used to beat the intermolecular forces that exist in the liquid phase and so the particles (molecules) can separate to change the state from liquid to gas.

The specific vaporization heat is given in units of joules per gram, meaning that to compute the total amount of heat you just need to multiply the specific vaporization heat times the amount of substance:

Heat energy = mass in grams × specific vaporization heat

Heat energy = 650 g × 723 J/g = 469,950 J ← answer,

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.