A nursing mother prepared her baby's milk mixture at 85o C, in a feeding bottle. In order to cool it to 40o C, she immersed the bottle in an aluminium bowl of heat capacity 90 J K -1 containing 500g of water at 26o C. If the mass of the mixture is 300g, calculate the specific heat capacity of the mixture.
[Neglect the heat losses and heat capacity of the bottle;
specific heat capacity of water = 4200 J kg-1 K-1]