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Endothermic reaction means reactions which absorbs heat energy to carry out reaction. So if the reactants are at colder condition, process/operation require much more heat energy,ie, heat energy consumption will be more.
Absorbed heat depends on the specific heat capacity of the substance. If you provide the substance and the temperature change, then we can help you calculate the heat absorbed.
540 calories per gram is absorbed when water vaporizes at its boiling point. Called the latent heat of vaporization. 540 x 23.1 x 18 = 224532 calories
To calculate the amount of ice needed, you need to use the formula Q = mcΔT, where Q is the heat required, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. First, calculate the heat released by the water as it cools from 27°C to 5°C. Then, calculate the heat absorbed by the ice as it melts at 0°C and warms up to 5°C. Finally, divide the total heat to be absorbed by the ice by the heat absorbed per gram of ice to find the mass of ice needed.
A poor reflector of heat is likely to be a good absorber because it is less effective at reflecting incoming heat energy away, leading to more of the heat being absorbed by the material. This means that the material can absorb more heat energy rather than reflecting it, making it a good absorber of heat.