Hess’s law of constant heat summation is based on conservation of mass. It deals with A) Equilibrium constant B) Reaction rate C) Changes in heat of reaction D) None Of Above Related MCQs: How many times Mass of earth is greater than the mass of Mars? Let us suppose a mass on Earth is 100 kg. What will be the mass of the moon? Heating wet steam at constant temperature is heating it at constant As compared to the constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of