In Problem 6.48 heats of mixing for binary mixtures of solid-phase cadmium (Cd) and tin (Sn) were reported as:

where, XCd and XSn are the cadmium and tin mole fractions, respectively. If we assume cadmium and tin form a regular solution, calculate the activity coeffi cient of cadmium in a mixture of 2 moles Cd and 3 moles Sn.

Problem 6.48

Enthalpies of mixing for binary mixtures of cadmium (Cd) and tin (Sn) have been fi t to the following equation at 500°C:

where, XCd and XSn are the cadmium and tin mole fractions, respectively. Consider a mixture of 3 moles Cd and 2 moles Sn.

Transcribed Image Text:

Ahmix = 13,000XcaXsn[J/mol]