The enthalpy of sublimation (direct conversion from solid to gas) of carbon diox

Question

The enthalpy of sublimation (direct conversion from solid to gas) of carbon dioxide is 26.1 kJ/mol. What value will the enthalpy of deposition (direct conversion from gas to solid) have? Use 3 significant figures.

The enthalpy of sublimation (direct conversion from solid to gas) of carbon dioxide is 26.1 kJ/mol. How much energy is required to sublimate 8.9 kg of carbon dioxide? Give your answer in kJ. The mass of carbon dioxide that shows up in this problem should have 2 sig figs, assume it does for rounding purposes

Explanation / Answer

enthalpy of deposition = - enthalpy of sublimation

= -26.1 KJ/mole

no of moles in 8.9 kg of CO2 ........molecular mass of CO2 =44 g

mole = 8.9 * 1000 / 44 =202.27 moles

now total energy = energy/mole * moles

total energy = 26.1 * 202.27 = 5279.247 KJ

now in two significant figures =53 KJ

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