A sample of 70 mmol Kr(g) expands reversibly and isothermally at 373 K from 5.25 cm³ to 6.29 cm³ , and the internal energy of the sample is known to increase by 83.5 J. Use the virial equation of state up to the second coefficient B = −28.7 cm³ mol⁻¹ to calculate w, q, and ∆H for this change of state.