Identify which of the following substances is not in its standard state. (a) CO(g) (b) Ca(s)...
The standard state of an element is defined as a) its state of matter at pressures less than 1 atm b) the energy of the element at room temperature c) the most stable form of the element under standard thermodynamic conditions d) the mass of the element of 25C For which of the followingreaction does delta H rxn = delta H f ? a) H2(g)+1/8S8(rhombic)->H2S(g) b) C(diamond)+O2(g)->CO2(g) c)H2(g)+CuO(s)->H2O(l)+Cu(s) d) O(g)+O2(g)->O3(g) e)A, B, and D
For which of the following substances is the standard free energy of formation not equal to zero at 298 K.? A) Cr(s) B)Kr(g) C)Ce(s) D)Na(g) E)O2(g)
15. A 100 g sample of each of the following metals is heated from 352C to 450C. Which metal absorbs the lowest amount of heat energy? Metal Specific Heat Zinc 0.389 J/g. °C) Aluminum 0.903 J/(g." Nickel 0.444 J/g. °C 0.228 J/(g. °C) C. Nickel A. Zinc D. Tin B. Aluminum Tin 16. Given: Ca(s) + O2 + 3H2(B) - Ca(OH)2(s); AH = -493.45 kJ What is Aw for the following thermochemical equation? Ca(OH),(s) - Ca(s) + O2(8) + H2(g)...
Identify which of the following equations are balanced. 2KMnO4(s)→K2MnO4(s)+MnO2(s)+O2(g) C(s)+O2(g)→CO(g) 6Li(s)+N2(g)→2Li3N(s) SF4(g)+2F2(g)→SF6(g) Part B Calculate the final pressure, in atmospheres, for each of the following, if volume and amount of gas do not change. a)A gas with an initial pressure of 1.22 atm at 67 ∘C is cooled to − 31 ∘C. b)A sample of N2 with an initial pressure of 810. mmHg at − 75 ∘C is heated to 31 ∘C.
All the following are oxidation–reduction reactions except: a.) H2(g) + F2(g) → 2HF(g). b.) Ca(s) + H2(g) → CaH2(s). c.) 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g). d.) 6Li(s) + N2(g) → 2Li3N(s). e.) Mg3N2(s) + 6H2O(l) → 3Mg(OH)2(s) + 2NH3(g).
All of the following chemical equations correspond to a standard enthalpy of formationEXCEPT a) CaO(s) + C(s) + O2(g)→CaCO3(s) b) H2(g) +½O2(g)→H2O(g) c) H2(g) +½O2(g)→H2O(l) d) N2(g) + 2 O2(g)→N2O4(g)e) C(s) + O2(g)→CO2(g) Answer: a Can someone explain why its answer A?
Which of the following processes have a ΔS > 0? A) Na2CO3(s) + H2O(g) + CO2(g) → 2 NaHCO3(s) B)CH4(g) + H2O(g) → CO(g) + 3 H2(g) C)CH3OH(l) → CH3OH(s) D)N2(g) + 3 H2(g) → 2 NH3(g) E)All of the above processes have a DS > 0.
8. Which one of the following substances is not a base? a) KOH b) Ca(ОН)2 c) NH3 d) HNO3 e) Cl 9. Which of the following species is NOT soluble? (a) Na2S (b) Рb(ОН)2 (c) KNO3 (d) KCl (e) (NH4)2CO3 10. Which of the following is a weak acid? a) HBr b) HCl c) NH3 d) HCIO4 e) HF
46. Which species in the reaction below undergoes reduction? H2O(g) + CO(g) -H2(g) + CO2(g) a. H20 b.CO CH2 d. co2 e. None 47. Which species is reduced in the reaction below? (aq) + CIO (aq) + 10 (aq) + C (aq) a. b. H20 c.cr d. 10 e. CIO 48. Which of the following elements generally acts as an oxidizing agent? a. Br2 b.H2 c. Fed . C e. Li 49. What is the oxidation number of Fe in...
2. Which of the following is in the correct order of standard state entropy? I. CO2(g) < CO(g) II. Br2(l) < Br2(g) III. S8(s) < S2(g) I need help with all 3 questions.. Please explain. 2. Which of the following is in the correct order of standard state entropy? I. CO1g)COG) II. Br2(l) <Br2(g) III. Ss(s)< S2(g) a. I only b. II only c. III only d. I and II only II and III only e. 3. Determine the value...