Practice ProblemBUILD
Given that the reaction
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Chemistry
- Predict the sign of the entropy change for the following processes. Indicate the reason for each of your predictions.(a) One mole liquid water at room temperature ⟶ one mole liquid water at 50 °C(b) Ag+(aq) + Cl−(aq) ⟶ AgCl(s)(c) C6 H6(l) + (15)/(2) O2(g) ⟶ 6CO2(g) + 3H2 O(l)(d) NH3(s) ⟶ NH3(l)arrow_forwardWhich system has the greatest entropy? (a) 1 mol of H21g2 at STP (b) 1 mol of H21g2 at 100 °C and 0.5 atm (c) 1 mol of H2O1s2 at 0 °C (d) 1 mol of H2O1l2 at 25 °Carrow_forwardWhich of the following conditions describe a reaction that is spontaneous at "low" temperature and nonspontaneous at "high" temperature? Group of answer choices: A) ΔH (-), ΔS (+) B) ΔH (+), ΔS (-) C) ΔH (+), ΔS (+) D) ΔH (-), ΔS (-) E) None are true.arrow_forward
- Do te the entropy change that occurs in the system when 56.2g of liquid hexane (86.17 g/mol) boils at its normal boiling point of 68.7°C. The enthaloy of vaporization for hexane is 3156 k/mol. (18) (A) (B) (C) (D) (E) 60.2 J/K 0.300 J/K 2.06 x 10 J/K 92.3 J/K 20.6 J/Karrow_forwardWhy does the entropy of halogens at room temperature increases in the following order I2 < Br2 < Cl2. Answer:arrow_forwardAmong other things, an ideal fuel for the control thrusters of a space vehicle should decompose in a spontaneous exothermic reaction when exposed to the appropriate catalyst. Evaluate the following substances under standard state conditions as suitable candidates for fuels.(a) Ammonia: 2NH3(g) ⟶ N2(g) + 3H2(g)(b) Diborane: B2 H6(g) ⟶ 2B(g) + 3H2(g)(c) Hydrazine: N2 H4(g) ⟶ N2(g) + 2H2(g)(d) Hydrogen peroxide: H2 O2(l) ⟶ H2 O(g) + (1)/(2)O2(g)arrow_forward
- Which substance has the higher entropy?(a) dry ice (solid CO2) at −78 °C or CO2(g) at 0 °C(b) liquid water at 25 °C or liquid water at 50 °C(c) pure alumina, Al2O3(s), or ruby (ruby is Al2O3in which some Al3+ions in the crystalline lattice are replaced with Cr3+ions)(d) one mole of N2(g) at 1 bar pressure or one mole of N2(g) at 10 bar pressure (both at 298 K)arrow_forwardb Which of the following are spontaneous processes? (Select all that apply.) electrolysis hydrogen and oxygen react to form water two bodies at thermal equilibrium exchange heat in such a way to establish different temperatures T₁ and T2, if we treat them together as an isolated system two bodies at different temperatures T₁ and T₂ exchange heat in such a way to establish thermal equilibrium at some intermediate temperature, if we treat them together as an isolated system the dye goes from being fully dispersed in solution to returning back to a concentrated drop separate from the rest of the solution ✓a dropped egg breaksarrow_forwardConsider the reaction: Ni2+(aq) + 6 NH3(aq) ⇌ Ni(NH3)62+(aq) K = 5.6 x 108 at 25 °C (a) Calculate ΔG° and state in which direction this reaction proceeds under standard conditions at 25 °C. (b) Determine ∆G when Ni(NH3)62+ is 0.010 M, Ni2+ is 0.0010 M, and NH3 is 0.0050 M and state which direction the reaction proceeds in these conditions at 25 °C.arrow_forward
- (a) Calculate ASuniy for the reaction H,02(1) – H,O,(g) at 175.0°C. Enter your answer in the box provided. J/K mol (b) Is the reaction spontaneous, nonspontaneous, or an equilibrium process? Select the best single answer. spontaneous nonspontaneous an equilibrium processarrow_forwardWhat is ΔHsys for a reaction at 16.9 °C with ΔSsurr = -159 J mol-1 K-1 ? Express your answer in kJ mol-1 to at least two significant figures. (Please type answer no write by hend)arrow_forwardCalculate ΔS° (in J/K) at 25°C for the following reactions, using standard entropy values. (a) Pb(s) + 1/2 O2(g) → PbO(s) J/K(b) CS2(g) + 4 H2(g) → CH4(g) + 2 H2S(g) J/K(c) C2H4(g) + 3 O2(g) → 2 CO2(g) + 2 H2O(g) J/K(d) Ca(s) + 2 HCl(aq) → CaCl2(aq) + H2(g) J/Karrow_forward
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