5.7 Many commercially-used polymers are actually blends of two or more different molecular weights, which gives a net composition with a bimodal molecular weight distribution. A. If an equal weight of polymers A, B and C (below) are blended, what are the new average Mn, average Mw, and polydispersity of the blend? Polymer A: Polymer B: Polymer C: Mn 200,000 350,000 150,000 Mw 600,000 400,000 150,000 PI 3.00 1.14 1.00 B. Draw (or sketch by hand) a qualitative graph to represent the results of running this blend through a gel permeation chromatograph. The y-axis is an indicator of intensity (refractive index or absorbance) and is proportional to the mass of polymers that are leaving the GPC column. Label the x- and y- axes and label the parts of the chromatograph to show the different polymers in the blend (A, B& C). Consider that the A, B & C peaks may overlap. A qualitative sketch is fine, but be sure to show the relative peak heights and widths that will result from the GPC. You may assume that the GPC packing material is capable of separating molecular weights (Mw) from 50,000 to 5,000,000. C. Draw a second qualitative graph by hand below the first one that shows what the output from the GPC would show if: i. the GPC column was rated for separations between Mw = 50,000 and 300,000 ii. using the original column the blend of polymers were not dilute.

25 1. T The specific heat of water is 4.18 J-g-¹ K-¹. How much heat is required to raise the temperature of 500 g of water from 20 °C to the boiling point (100 °C)? What is the molar heat capacity of water? Specific heat of 11₂0= 4₁185.5-1-14-1 motor mass of waver: 18,001g/mol mas of water = 5003 a. 5 D HRAMCAT Hear = 500g (thit 3). 2014 Initial Temp: 20%= 2931 molar hear capacity & spresse head capacting of w Anal Temp: 100% = 3731 Hear =? Molar heat coperty? Hent = 1672003 Hear = 167.23 = 4.182 * 75,23/10.19 2. In studying the energy generated by a person, you may view the person roughly as a constant pressure calorimeter using sugar (i.e., sucrose, C12H22O11) to generate power. The reaction of table sugar in a calorimeter is given by C. Q b. Calculate the enthalpy of combustion per mole of sugar utilization. Does the result of your calculation make sense? C12H22O11(s)+120₂(g) →12CO₂(g)+11H₂O+heat. →give the magnitudo (no sign is recessure) What is the heat released by consuming one…

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4 attempts left Check my work Enter your answer in the provided box. Report probi Water gas, a mixthře of H, and CO,, is a fuel made by reacting steam with red-hot coke (a by product of coal distillation): Hint Solution H,O(g) +C(s) S CO(g) +H;(g) Guided Soluti Using a table of thermodynamic data, estimate the temperature at which the reaction begins to favor the formation of products. °C