Calculate the amount of heat required to completely sublime88.0g of solid dry ic

Calculate the amount of heat required to completely sublime88.0g of solid dry ice (CO2) at its sublimation temperature. Theheat of sublimation for carbon dioxide is 32.3 kJ/mol. I calculated67.66 kJ and mastering chemistry is saying Not quite. Checkthrough your calculations; you may have made a rounding error orused the wrong number of significant figures. I dont know what todo differently