How much heat is needed to change 4.3kg of carbon dioxide from dry ice (solid) to liquid carbon dioxide?
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The amount of heat required to change a substance from one phase to another is given by the specific heat of that substance and its change in temperature during the phase change.
In the case of carbon dioxide, the phase change from solid to liquid occurs at a constant temperature of -56.6°C, which is known as the sublimation point of dry ice. Therefore, the amount of heat required to change 4.3 kg of dry ice to liquid carbon dioxide is:
Q = m * ΔH
where Q is the amount of heat required, m is the mass of dry ice, and ΔH is the enthalpy of sublimation of carbon dioxide.
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