One thousand kg/h of a 45 wt% acetone-in-water solution is to be extracted at 25c in a continuous, countercurrent system with pure 1,1,2-trichloroethane to obtain a raffinate containing 10 wt%acetone. using the following equilibrium data, determine with an equilateral-triangle diagram: (a) the minimum flow rate of solvent; (b) the number of stages required for a solvent rate equal to 1.5times minimum; (c) the flow rate and composition of each streamleaving each stage.. table 1 is for extractacetone weight fraction water weight fraction trichloroethane weight fraction0.60 0.13 0.270.50 0.04 0.460.40 0.03 0.570.30 0.02 0.680.20 0.015 0.7850.10 0.01 0.89table 2 for raffinateacetone w. f water w. f tce w. f0.55 0.35 0.100.50 0.43 0.070.40 0.57 0.030.30 0.68 0.020.20 0.79 0.010.10 0.895 0.005tie line dataraffinate w. f acetone extract w. f acetone0.44 0.560.29 0.400.12 0.18

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

the answer would be c

i'm assuming that the correct answer is indeed the first one/ "a"..

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.