The standard enthalpy change for the sublimation of solid carbon dioxide CO2 can be calculated using the following formula:H = m H_subwhere H is the enthalpy change, m is the mass of CO2, and H_sub is the standard enthalpy of sublimation for CO2.The standard enthalpy of sublimation for CO2 at 25C 298 K is approximately 25.2 kJ/mol.First, we need to convert the mass of CO2 50 g to moles. The molar mass of CO2 is 12.01 g/mol C + 2 16.00 g/mol O = 44.01 g/mol.moles of CO2 = mass / molar mass = 50 g / 44.01 g/mol 1.136 molesNow, we can calculate the enthalpy change:H = m H_sub = 1.136 moles 25.2 kJ/mol 28.63 kJThe standard enthalpy change for the sublimation of 50 g of solid carbon dioxide at 25C is approximately 28.63 kJ.