The figure to the right illustrates the long-run average cost curve for a company that makes motors. Suppose the company produces 15 thousand motors per month. Is it experiencing economies of scale, diseconomies of scale, or constant returns to scale? If the company produces 15 thousand motors, then it experiences diseconomies of scale At what level of output does the firm experience the minimum efficient scale? The minimum efficient scale occurs when the firm produces (Enter your response as an integer.) thousand motors. Average total cost 48.00 Long-run average cost 44.00 40.00 36.00 32.00 28.00 24.00 20.00- 16.00 12.00- 8.00- 4.00- 0.00 0 2 4 6 8 10 12 14 16 18 20 Quantity (motors per month in 1,000s) G

9.72 Although it can be a nuisance when a laptop computer freezes up and needs to be rebooted, we accept that as somewhat inevitable. But clearly the need to occasionally reboot the control system for the power grid would not be acceptable. Use the web to research ways that engineers ensure the reliability of crucial systems like the control infrastructure of the grid, and write a paragraph summarizing the main strategies employed.

Consider the following reaction: N2(g)+3H2(g)2NH3(g) Calculate G for this reaction under the following conditions (assume an uncertainty of 1 in all quantities): a. T=298K,PN2=PH2=200atm,PNH3=50atm b. T=298K,PN2=200atm,PH2=600atm,PNH3=200atm

In the 1880s, Frederick Trouton noted that the enthalpy of vaporization of 1 mol pure liquid is approximately 88 times the boiling point, Tb, of the liquid on the Kelvin scale. This relationship is called Troutons rule and is represented by the thermochemical equation liquid gas H = 88 Tb, joules Combined with an empirical formula from chemical analysis, Troutons rule can be used to find the molecular formula of a compound, as illustrated here. A compound that contains only carbon and hydrogen is 85.6% C and 14.4% H. Its enthalpy of vaporization is 389 J/g, and it boils at a temperature of 322 K. (a) What is the empirical formula of this compound? (b) Use Troutons rule to calculate the approximate enthalpy or vaporization or one mole of the compound. Combine the enthalpy of vaporization per mole with that same quantity per gram to obtain an approximate molar mass of the compound. (c) Use the results of parts (a) and (b) to find the molecular formula of this compound. Remember that the molecular mass must be exactly a whole-number multiple of the empirical formula mass, so considerable rounding may be needed.