Question

What is the heat of sublimation of carbon dioxide (CO2) if 50 g solid CO2 is completely converted into gas phase without changing the temperature and pressure conditions? Given: The molar heat of sublimation of CO2 is 25.2 kJ/mol.

Answer 1

To calculate the heat of sublimation for the given amount of CO2, we first need to determine the number of moles of CO2. The molar mass of CO2 is approximately 44.01 g/mol  12.01 g/mol for carbon and 2 * 16.00 g/mol for oxygen .Number of moles of CO2 =  mass of CO2  /  molar mass of CO2 Number of moles of CO2 = 50 g / 44.01 g/mol = 1.136 molesNow, we can use the molar heat of sublimation to find the total heat of sublimation for the given amount of CO2.Heat of sublimation =  number of moles of CO2  *  molar heat of sublimation Heat of sublimation = 1.136 moles * 25.2 kJ/mol = 28.62 kJTherefore, the heat of sublimation of 50 g of carbon dioxide is approximately 28.62 kJ.