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- What is the saturation pressure, in Pa, of diethyl ether at 276.9 K?Calculate the value of the equilibrium constant, Ke , for the reaction Q(g) + X(g) = 2 M(g) + N(g) given that M(g) = Z(g) 6 R(g) = 2 N(g) + 4Z(g) 3 X(g) + 3 Q(g) = 9R(g) Kel = 3.52 K2 = 0.585 Kc3 12.3 K. IICalculate the value of the equilibrium constant, Ke, for the reaction Q(g) + X(g) 2 M(g) + N(g) given that Ke = M(g) = Z(g) 6R(g) = 2N(g) + 4 Z(g) 3 X(g) + 3 Q(g) = 9R(g) .116 Kel = 3.57 Kc2 = 0.524 Kc3 = 14.6
- Any of the types of distillation we use to separate a medicinal substance dissolved in a mixture of solvents consisting of Diethylether, Dichloromethane and Dimethylsulfoxide, knowing that the substance loses its medicinal effectiveness when exposed to a temperature higher than 15OC.Ethyl alcohol and water in liquid form are also an azeotropic mixture. Why is that?C6H12O6(aq) + 6O2(g) 6CO2(g) + 6H2O(l)ΔH = –2802.7 kJ mol –1a) Write an expression for the equilibrium constant for this reaction.b) At equilibrium, the concentration of the reactants and products are determined as [CO2] = 0.30 M, [O2] = 0.040 M and [C6H12O6] = 0.065 M. Determine the value of the equilibrium constant (Kc) and predict the whether the products or reactants will be favoured at equilibrium.c) Given that the concentrations of the reactants and products at a particular time are [CO2] = 0.65 M, [O2] = 0.020 M and [C6H12O6] = 0.055 M, determine the reaction quotient (Qc). Compare the Kc and Qc values and predict the favoured direction of the reaction.d) Explain the effect on equilibrium of:i) Increasing temperatureii) Increasing pressureiii) Decreasing the concentration of oxygeniv) Increasing the concentration of carbon dioxidev) Adding a catalyst
- A parcel of unsaturated air contains a mixture of dry air and water vapor. The specific humidity q of the air parcel is 12 g kg^−1. Recall that q = Mv / (Mv+Md),where Mv is the mass of the water vapor and Md is the mass of the dry air. This is equivalent to what we have been calling the fractional concentration of water vapor by mass. (a) If the air parcel is at a temperature T= 25◦C , what is the virtual temperature of the air parcel? (b) If the air parcel is at a temperature T= 25◦C and a pressure of 1000 hPa, what is the relative humidity of the air parcel? (c) What is the apparent molar mass of the air parcel?Calculate the amount of ester, CH3COOCHs formed when 2.00 moles of ethanoic acid,CH3COOH and 2.00 moles of ethanol, C2HsOH are allowed to come to equilibrium at 300 K CH3CO0C2Hs(aq) + H2O(1) Kc=4.12 (ANS = nCH3COOCHs= 1.414 mole; mass CH3COOC2Hs= 124.43 g)Refer to the ternary phase diagram in Fig. 5E.4. How many phases are present, and what are their compositions and relative abundances, in a mixture that contains 55.0 g of water, 8.8 g of trichloromethane, and 3.7 g of ethanoic acid? Describe what happens when (i) water, (ii) ethanoic acid is added to the mixture.
- When ethyl acetate in dilute aqueous solution is heated in the presence of a small amount of acid, it decomposes to acetic acid and ethanol according to the equation CH;COOC;Hs + H;0 -> CH3COOH + C2HSOH Since the reaction takes place in dilute solution, the quantity of water present is so great that the loss of the small amount which combines with ethyl acetate produces no appreciable change in the total amount. Hence, of the reacting substances, only ethyl acetate suffers a measurable change in concentration. A chemical reaction of this sort, in which the concentration of only one reaction substance changes, is called a first-order reaction. It is a law of physical chemistry that the rate at which a substance is being used up in a first order reaction is proportional to the amount of that substance instantaneously present. If the initial concentration of ethyl acetate is Co, find the expression for its concentration at any time t.Calculate the value of the equilibrium constant, Ke , for the reaction Q(g)+X(g) = 2 M(g)+N(g) given that M(g) Z(g) 6 R(g) = 2 N(g) + 4 Z(g) 3 X(g) + 3 Q(g) 9R(g) Kei 3.59 Kc2 0.567 Kc3 = 13.8 K. =For an ethanol-chloroform mixture at 545 mmHg, determine: a) The Liquid - Vapor equilibrium diagram (1pt) b) Boiling temperature with 20% mass of ethanol (1pt) c) The composition of a mixture that has gone through two distillation stages (1pt)