Consider the process by which lead chloride dissolves in water:
(b) Based only on
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Chemistry: Principles and Reactions
- Actually, the carbon in CO2(g) is thermodynamically unstable with respect to the carbon in calcium carbonate(limestone). Verify this by determining the standardGibbs free energy change for the reaction of lime,CaO(s), with CO2(g) to make CaCO3(s).arrow_forwardWhen 7.11 g NH4NO3 is added to 100 mL water, the temperature of the calorimeter contents decreases from 22.1 C to 17.1 C. Assuming that the mixture has the same specific heat as water and a mass of 107 g, calculate the heat q. Is the dissolution of ammonium nitrate exothermic or endothermic?arrow_forwardDescribe a nonchemical system that is not in equilibrium, and explain why equilibrium has not been achieved.arrow_forward
- According to the Resource Conservation and Recovery Act (RCRA), waste material is classified as toxic and must be handled as hazardous if the lead concentration exceeds 5 mg/L. By adding chloride ion, the lead ion will precipitate as PbCl2, which can be separated from the liquid portion. Once the lead has been removed, the rest of the waste can be sent to a conventional waste treatment facility. How many grams of sodium chloride must be added to 500 L of a waste solution to reduce the concentration of the Pb2+ ion from 10 to 5 mg/L?arrow_forwardFor each situation described in Question 13, predict whether the entropy of the system increases or decreases.arrow_forwardThe equilibrium constant for a certain reaction increases by a factor of 6.67 when the temperature is increased from 300.0 K to 350.0 K. Calculate the standard change in enthalpy (H) for this reaction (assuming H is temperature-independent).arrow_forward
- When a mixture of hydrogen and bromine is maintained at normal atmospheric pressure and heated above 200. °C in a closed container, the hydrogen and bromine react to form hydrogen bromide and a gas-phase equilibrium is established. Write a balanced chemical equation for the equilibrium reaction. Use bond enthalpies from Table 6.2 ( Sec. 6-6b) to estimate the enthalpy change for the reaction. Based on your answers to parts (a) and (b), which is more important in determining the position of this equilibrium, the entropy effect or the energy effect? In which direction will the equilibrium shift as the temperature increases above 200. °C? Explain. Suppose that the pressure were increased to triple its initial value. In which direction would the equilibrium shift? Why is the equilibrium not established at room temperature?arrow_forwardWhich molecule, F2, Cl2, Br2, or I2, has the weakest chemical bond?arrow_forwardCopper(I) ions in aqueous solution react with NH3(aq) according toCu+(aq) + 2NH3(aq) → Cu(NH3)2+(aq) Kf = 6.3 × 1010Calculate the solubility (in g·L-1) of CuBr(s) (Ksp = 6.3 × 10-9) in 0.62 M NH3(aq).62.3solubility of CuBr(s):arrow_forward
- Select the reaction for which K, = Kc. 2 CO, (g) + 2 CF,(g) =4 COF, (g) NH,NO, (s) = N,O(g) + 2H,O(g) 2 H, S(g) + SO, (g) = 3 S(s) + 2 H,O(g) O 2 Na, O, (s) + 2CO,(g) =2 Na,CO;(s) + 0,(g)arrow_forwardThe decomposition of a generic diatomic element in its standard state is represented by the equation X,(g) X(g) Assume that the standard molar Gibbs energy of formation of X(g) is 4.23 kJ · mol-1 at 2000. K and –56.22 kJ · mol-1 at 3000. K. Determine the value of the thermodynamic equilibrium constant, K, at each temperature. At 2000. K, AG; = 4.23 kJ · mol-1. What is K at that temperature? K at 2000. K = At 3000. K, AG{ -56.22 kJ · mol-1. What is K at that temperature? K at 3000. K =arrow_forwardConsider the reaction 3A(g)+2B(g)=2C(g)+1D(aq). In 3.1L, 2.79mol A and 2.72mol B are mixed. At equilibrium, 0.573mol D are detected. What is the concentration equilibrium constant (K) of the reaction? Enter your answer to four decimal places if it is less than 1, otherwise answer with a minimum of four digits (ie: 2543, 153.4, 12.52, or 6.523). If your last digit is a trailing zero remember that it's okay that canvas removes it. If it is smaller than 0.0001, enter "0" and make sure you indicate your actual answer clearly on your work.arrow_forward
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