5. For the species in the reaction: 2Co(s) + H2(g) 8PF3(g) → 2HCo(PF3)4(l), which component is ΔH0f equal zero?

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Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the Δ⁢Grxn∘ of each reaction using values from the table of thermodynamic properties. (1)H2(g)+O2(g)↽−−⇀H2O2(l) Δ?∘rxn=   kJ⋅mo^l−1 (2)H2O(l)+12O2(g)↽−−⇀H2O2(l)

Ethylene (C2H4) plays an important role in the ripening of certain fruits and vegetables. It is sometimes supplemented under controlled conditions at produce—processing facilities but is also produced naturally by many fruit-bearing plants.  Although the actual process by which plants produce ethylene is a complex one, imagine that it is produced by the simple breakdown of glucose according to the equation: C6H12O6 (s)  à 3 C2H4 (g) + 3 O2 (g)   Given S°= 212.1 J/molK, DG°= -910.56 kJ/mol and DH°= -1274.5 kJ/mol for C6H12O6 (s).   a.) Determine the sign of DS° for the reaction. b.) Calculate DS° for the reaction. c.) Using the tabulated DG° values in the appendix, calculate DG° for the reaction. d.) Above what temperature (in °C) is the reaction spontaneous? Hint: you will first have to calculate DH° using tabulated values.

A student dissolves 12.3 g of ammonium chloride (NH4C1) in 200. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 21.0 °C to 17.4 °C over the course of 3.6 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH₂Cl(s) NH(aq) + Cl(aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 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 exothe nic, 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 ΔΗ per mole of NH Cl. rxn exothermic 0…

Indicate whether the reaction is exothermic or endothermic N204 (g) → 2NO2(g) AH® = +58.0k)

Consider the reaction. 2 Fe₂0₂4Fe +30₂ AHin = +824.2 kJ The formation of 62.0 g of Fe results in the release of 229 kJ of heat. the absorption of 229 kJ of heat. O the release of 12800 kJ of heat. the release of 915 kJ of heat. the absorption of 12800 kJ of heat. the absorption of 915 kJ of heat.

A chemist measures the enthalpy change AH during the following reaction: 2 Al(OH),(s)-Al,0,(s) + 3H,0(1) AH=41. kJ Use this information to complete the table below. Round each of your answers to the nearest kJ/mol. reaction ΔΗ 3AI,0,(s) + 9H,0() 6Al(OH),(s) Al,0,(s) + 3H,0() 2Al (OH), (s) Al(OH),(6) - Al,0,(0) + ,00 1 Al,0,(5) + H,0() O kJ Explanation Check 2021 McGra M B

A student dissolves 12.3 g of ammonium chloride (NH4Cl) in 200. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 21.0 °C to 17.4 °C over the course of 3.6 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH4Cl (s) NH(aq) + CT (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 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 ΔΗ per mole of NH Cl. rxn n exothermic…

4.71 g of MgSO4 is placed into 100.0 mL of water. The water's temperature increases by 6.70°C. Calculate AH, in kJ/mol, for the dissolution of MgSO4. (The specific heat of water is 4.184 J/g.°C and the density of the water is 1.00 g/mL). You can assume that the specific heat of the solution is the same as that of water.