For reaction 4C3H8(g) →3C4H10(g) + H2(g) calculate AG at 25 °C. Express your answer in kilojoules per mole to three significant figures. AG° = = ΟΙ ΑΣΦ ? kJ mol-1

이 O₂N Br NaOH, 80 °C then H3O+

Calculate the standard enthalpy change for the reaction at 25 C. Standard enthalpy of formation values can be found in this list of thermodynamic properties. 2 CH,OH(g) + 30,(g) → 2 CO,(g) + 4 H, O(g) 2 CO, (g) + 4 H,0(g) kJ AHixn %3|

A student dissolves 11.8 g of sodium hydroxide (NaOH)in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 20.0 °C to 33.6 °C over the course of 8 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NaOH(s) Na (aq) + OH (ag) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy AH per mole of NaOH. O…

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Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 48.1 g of KNO3KNO3 is dissolved in 229 g of water at 23.00 °C.   KNO3(s)−→−−H2OK+(aq)+NO−3(aq)   The temperature of the resulting solution decreases to 17.80 °C. Assume that the resulting solution has the same specific heat as water, 4.184 J/(g·°C), and that there is negligible heat loss to the surroundings. How much heat was released by the solution? ?soln=   kJ What is the enthalpy of the reaction? Δ?rxn=   kJ/mol

Measurements show that the energy of a mixture of gaseous reactants increases by 178. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that - 143. kJ of work is done on the mixture during the reaction. Calculate the change in enthalpy of the gas mixture | kJ during the reaction. Round your answer to 3 significant digits. x10 ? exothermic Is the reaction exothermic or endothermic? endothermic

2. The predominant forms of heavy metals (Zn, Pb, Fe, Cu, Ni, etc.) in aerobic sediments are the carbonates and the oxide or hydroxide forms. An important consideration in modeling the sediment is the stable chemical form of the metal in question. Consider the reaction: AG = 25 kJ/mol Pb(OH)₂ (s) + CO₂(aq) → PbCO₂ (s) + H₂O a. At what partial pressure of CO₂(g) will Pb(OH)2(s) and PbCO3(s) be at equilibrium? b. If the system is at equilibrium with the atmosphere, Pc02-10-3.38 atm, calculate 4G for the reaction. What is the stable form of lead in the sediments?