An insulated calorimeter initially holds 250 g of water at 20 °C. The calorimeter has a heat capacity of 150 J °C⁻¹. A 120 g sample of metal M at 150 °C is added, and the system reaches equilibrium at 28 °C. What is the specific heat capacity of metal M?
a) 0.61J g−1∘C−1
b) 0.65J g−1∘C−1
c) 0.90J g−1∘C−1
d) 0.57J g−1∘C−1