How many of the following processes are nonspontaneous? climbing stairs dissolving salt in water converting table salt to its elements 2 H,0(1) → 2 H2(g) + O2(g) A) O B) 1 C) 2 D) 3 E) 4

13. Energy is stored in the body in adenosine triphosphate, ATP, which is formed by reaction between adenosine diphosphate, ADP, and dihydrogen phosphate ions. ADP3-(aq) + H2PO42-(aq) -----> ATP4-(aq) + H2O (l) ΔH° = 38 kJ Is the reaction endothermic or exothermic?

A student dissolves 10.9 g of ammonium chloride (NH,Cl) in 200. g of water in a well-insulated open cup. She then observes the temperature of the water fall from 20.0 °C to 16.1 °C over the course of 3.8 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH,CI (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 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. Ar exothermic Is this reaction exothermic, endothermic, or neither? endothermic neither If you said the rea heat that was released or absorbed by the reaction in this case. I kJ ion was exothermic or endothermic, calculate the amount of kJ…

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)

Aqueous solutions of calcium chloride and sodium hydroxide react to form solid calcium hydroxide. The balanced net ionic equation is: A) Ca+2(aq) + 2OH-(aq) + 2Na+(aq) + 2Cl-(aq) → Ca(OH)2(s) B) Ca+2(aq) + 2OH-(aq) + Na+(aq) + Cl-(aq) → Ca(OH)2(s) C) Ca+2(aq) + 2OH-(aq) → Ca(OH)2(s) D) CaCl2(aq) + 2NaOH(aq) → CaOH(s) + NaCl(aq) E) CaCl2(aq) + 2NaOH(aq) → Ca(OH)2(s) + 2NaCl(aq)

2. Please calculate the standard enthalpy of reaction (AHrxn, in kJ/mol) for the preparation of nitrous acid, HNO2, using the thermodynamic data given below. Preparation of nitrous acid: HCl(g) + NaNO2(s) → HNO2(1) + NaCl(s) 2NaCl(s) + H₂O(l) → 2HCl(g) + Na₂O(s) NO(g) + NO₂(g) + Na2O(s) → 2NaNO2 (s) NO(g) + NO₂(g) → N₂O(g) + O₂(g) 2HNO2(1)→ N₂O(g) + O2(g) + H₂O(g) H₂O(1)→ H₂O(g) ΔΗ = 507.31 kJ/mol AH = -427.14 kJ/mol AH = - 42.68 kJ/mol 34.35 kJ/mol ΔΗ ΔΗ = 44.012 kJ/mol =

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…

A student dissolves 11.0 g of potassium hydroxide (KOH) in 200. g of water in a well-insulated open cup. He then observes the temperature of the water rise from 22.0 °C to 33.7 °C over the course of 8.5 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: КОН(:) K*(aq) + OH (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 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. O exothermic Is this reaction exothermic, endothermic, or neither? O endothermic O 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. I kJ Calculate…

1) Choose the formation reaction for Li2SO4. A) 2 Li(s) + 1/8 S8(s, rhombic) + 2 O2(g) B) 16 Li(s) + S8(s, rhombic) + 16 O2(g) → C) L¡2SO4(aq) D) 8 L¡2SO4(s) E) 2 Li*(aq) + SO4² (aq) LiżSO4(s) 8 LizSO4(s) 2 Li*(aq) + SO,²-(aq) 16 Li(s) + S§(s, rhombic) + 16 O2(g) Lİ2SO4(aq)