5. It is possible to make crystalline solids that are only one layer of atoms thick. Such two- dimensional" crystals can be created by

d. THi I need help with question 5, which is uploaded

5. It is possible to make crystalline solids that are only one layer of atoms thick. Such "two-dimensional” crystals can be created by depositing atoms on a very flat surface. (a) If the atoms in such a two-dimensional crystal can move only within the plane of the crystal,what will be its molar heat capacity near room temperature? Give your answer as a multiple ofR and in J/mol.K (b) At very low temperatures, will the molar heat capacity of a two-dimensional crystal begreater than, less than, or equal to the result you found in part (a)? Explain why.