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Which reaction is expected to have the largest decrease in entropy? A. 2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O(l) B. 2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(l) C. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) D. 2 CO(g) + O2(g) → 2 CO2(g)
Sucrose, C12H22O11, is hydrolysed with excess water and the glucose formed is then fermented. C12H22O11(aq) + H2O(l) → 2 C6H12O6(aq) C6H12O6(aq) → 2 C2H5OH(aq) + 2 CO2(g) Mr of C12H22O11 = 342.34 Mr of…
Equal volumes of the gases Q2 and R2 are mixed in a sealed container and react until one of them is used up, forming the gas QR2. The volume of QR2 formed, measured under the same conditions, is 50 cm3.…
Equal volumes of nitrogen and hydrogen are mixed and react according to the equation below. The volumes of the two reactants are measured at intervals. N2(g) + 3 H2(g) → 2 NH3(g) Which graph shows how the volumes of the two reactants change with time? A.…
What volume of hydrogen, in cm3, is produced at STP when 0.810 g of aluminium reacts with an excess of hydrochloric acid? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) Molar volume of an ideal gas at STP = 22.7 dm3 mol−1 A. 341 B.…
The following mechanism has been proposed for the reaction between nitrogen(II) oxide and hydrogen. 2 NO(g) ⇌ N2O2(g) fast N2O2(g) + H2(g) → N2O(g) + H2O(g) slow Which rate equation is consistent with this mechanism? A.…
The dotted line shows the volume of hydrogen produced when an excess of magnesium ribbon is added to 50 cm3 of 2.0 mol dm−3 hydrochloric acid. Which curve shows the volume of hydrogen produced when the same excess of magnesium ribbon…
Which of the following correctly describes the effect of a catalyst on a reaction? A. It increases the frequency of collisions between reactant particles B. It increases the proportion of collisions with energy greater than or equal to the activation energy C.…
Which reaction has the lowest activation energy? A. HBr(g) → H(g) + Br(g) B. 2 Cl(g) → Cl2(g) C. CH4(g) + Cl(g) → CH3(g) + HCl(g) D. HBr(g) → H+(g) + Br−(g)
Carbon monoxide reacts with chlorine to form phosgene, COCl2. CO(g) + Cl2(g) ⇌ COCl2(g) K = 2.75 × 103 at 45 °C ΔG = −RTln K R = 8.31 J K−1 mol−1 What is the Gibbs energy change, ΔG, in…