Last seen: Oct 19, 2020
(d) 34.465 kJ Explanation: W = – 2.303 nRT log V2/V1 Given n = 6, T = 27°C = 273 + 27 = 300 K V1 = 1 L, V2 = 10 L ∴ W = – 2.303 × 6 × 8.314 × ...
(d) S increases Explanation: When solid melts S increases because when solid changes into liquid randomness increases.
(d) (–x – 2y + z) kJ Explanation: From given data, we have C + O2 → CO2 -xkJ ....(i) H2 + 1/2O2 → H2O - ykJ ....(ii) CH4 + 2O2 → C...
(d) ΔG – ve, ΔH –ve and ΔS +ve Explanation: Since ΔG = ΔH - TΔS If ΔG is negative, ΔH is negative and ΔS is positive, then the reaction will be ...
(a) x + y Explanation: 2s.png So using Hess law, we get ΔHsublimation = ΔHfusion + ΔHvap = x + y
(b) – 88 kJ Explanation: ΔH = -92.2 kJ, P = 40 atm, ΔV = -1 L Using ΔH = ΔE + PΔV => ΔE = ΔH - PΔV = (-92.2kJ) - (40 atm) (-1L) x R/R =...
(d) may be positive or negative. Explanation: Heat is released in an exothermic process which increases the entropy of surroundings. When entro...
(b) -87.42 k.J Explanation: ΔE = ΔH - ΔnRT = -92.38 - (-2 x 8.31 x 298/1000) = - 92.38 + 4.95 = - 87.43 kJ
(a) ΔG = 0 Explanation: ΔG = 0 at equilibrium.
(d) Total entropy change is always positive Explanation: Total entropy change (system and surrounding) is always positive.
(a) ΔU < 0, w = 0 Explanation: Zn + H2SO4 → ZnSO4 + H2 In bomb calorimeter, there is no expansion in volume, so, work done will be zero. This...
(b) C(graphite) + 1/2O2(g) + 2H2 → CH3OH(l) Explanation: Heat of formation is defined as the heat exchange when one mole of a compound is formed f...
(c) - 35.5 kJ Explanation: C + O2 = CO2 ΔH = -490 kJ/mol (i) H2 + 1/2O2 = H2O ΔH = -240 kJ/mol (ii) 8C + 9H2 = C8H18 ΔH = +160 kJ/mol (iii...
(d) PH3, AsH3, NH3 Explanation: The order of heat of vaporisation or boiling point of the hydrides of VA group depend upon their molecular weight....
(c) NaNO3(s) ⇌ Na+(aq) + NO-3(aq) Explanation: Entropy (ΔS) of a reaction is positive if the products are in more random state as compared to reac...
(d) -602 kJ/mol Explanation: Heat produced (Q) = mCΔT = 1× 1.23 × 6.12 kJ. Molecule weight of NH4NO3 = 80 g Heat produced per mole = 80 ×...
(a) 11.4 kJ Explanation: The chemical reaction between strong base and strong acid is a neutralisation reaction between H+ ion and OH- ion. H+ +...
(c) negative Explanation: Enthalpy of reaction (ΔH) = Hp - HR For exothermic reactions, Hp < HR ΔH is negative.
(c) +5.684 kJ Explanation: For isothermal reversible process, Wev = -2.303 nRT log P1/P2 = -2.303 × 2 × 8.314 × 373 log 10/25 = + 5684.1 J =...
(b) -1229.3 k cal Explanation: ΔE = -1228.2 k cal = -1228.2 x 103 cal ΔH = ΔE + ΔnRT = -1228.2 x 103 + (-2)(2)(298) = -1229392 cal = -1229...