Question

the heat of sublimation of dry ice (solid carbondioxide) is 570 J/g. Determine the amount of heat required to turn a 2.2 kg bag of dry ice into gaseous carbondioxide.

Answer 1

Dear Student,

$$\begin{gathered} \mathrm{mass}\mathrm{of}\mathrm{dry}\mathrm{ice},\mathrm{m}=2.2\mathrm{kg} \\ \mathrm{heat}\mathrm{of}\mathrm{sublimation}\mathrm{of}\mathrm{dry}\mathrm{ice},∆\mathrm{H}=570\mathrm{J}/\mathrm{g} \\ \mathrm{or}∆\mathrm{H}=570\times \frac{1000}{1000}\mathrm{kJ}/\mathrm{kg}=570\mathrm{kJ}/\mathrm{kg} \\ \mathrm{Q}=\mathrm{m}∆\mathrm{H} \\ \mathrm{Q}=2.2\times 570=1254\mathrm{kJ} \end{gathered}$$