Choose the statement(s) that is/are true of the molar heat capacity of a monatomic gas. (i) the molar heat capacity at constant pressure (cmp) is the same as the molar heat capacity at constant volume (cmv ). (ii) the molar heat capacity at constant volume is approximately 12.5\: j.\: mol^{-1}.k^{-1} 12.5 j . m o l − 1 . k − 1 (iii) the molar heat capacity at constant pressure is approximately 25.5\: j.\: mol^{-1}.k^{-1} 25.5 j . m o l − 1 . k − 1 (iv) c_{mv}\: -c_{mp}\: =\: 8.3\: j.\: mol^{-1}.k^{-1}