Please help with this problem A substance with specific heat 0.2 cal/(g ⋅°C) which is initially at 70 °C comes into contact with the same amount of another specific heat substance 0.5 cal/(g ⋅°C). The final temperature when equilibrium is reached is 46 °C. Calculates the initial temperature of the second substance.

A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.