Which of the following equations are balanced? Balance those that need it.
(a)
(b)
(c)
(d)
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Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
- Direct methanol fuel cells (DMFCS) have shown some promise as a viable option for providing "green" energy to small electrical devices. Calculate E° for the reaction that takes place in DMFCS: CH3OH(I) + 3/2 02(g) → CO2(g) + 2 H20(1) Use the following values. AG°H,0(1) = -237 kJ/mol AG°O2(g) = 0 kJ/mol AG°CO2(9) = -394 kJ/mol AG°CH3OH(I) = -166 kJ/mol. E° = Varrow_forwardCao (s) (calcium oxide) is the main ingredient of concrete. While mixing Cao with water, the mixture gets hotter rapidly by its own. The chemical equation of the reaction is given below. Cao (s) + H20 (liq) > Ca(OH)2 (s) Based on the above information, which of the following is correct for the above process to mix Cao (s) with water. O a. AH> 0, AS> 0, AG0, AG 0 , ΔS> 0 , ΔG>0 O e. AH0, AG>0 O f. AH 0arrow_forwardPotassium superoxide, KO2, is used in rebreathing masks to generate oxygen according to the reaction below. If the mask contains 0.250 mol KO2 and 0.200 mol water, what is the limiting reagent? How many moles of excess reactant will there be once the reaction is complete? 4 KO2(s) + 2 H2O(ℓ) → 4 KOH(s) + 3 O2(g)arrow_forward
- Which of the equations below best represents how excess acid in the blood plasma can be removed in the lungs by breathing? H+ (aq) + 0. 2(g) OH + H₂ CO (aq) OH+ + O (aq) 2(g) → H, CO. H + O₂ (aq) 2(g) 3(aq) 3(aq) → H₂O(g) + CO2(g) + CO2(g) → H₂O H, CO3(aq) → HCO, OH t + HCO3(aq) → H₂ CO3(g) → H₂O(g) (aq) → H, CO3(aq) 3 (aq) + CO2(g) H₂O(g) + CO2(g)arrow_forwardThe reaction CO (g) + H2O(g) CO2(g) 2 + H2(g) has ΔH = -41 kJ/mol. Does the amount of H2 in an equilibrium mixture increase or decrease when the temperature is decreased?arrow_forwardBalance the following (fictional) chemical equations by supplying the correct coefficient. Do not leave any space blank (in other words, write in 1 if you would be leaving it blank): R(OZ)2 - RY2+ Z20 a) ZY+ b) D2 (g) + L2 (g) – DL3 (e)arrow_forward
- Consider the following reaction at 25°C with the ΔG°’ = +1800 J/mol for the forward reaction.The molar concentrations at the beginning of the reaction were [A] = 19 mM and [B] = 10 mM.After 1 hour, the concentrations were [A] = 16 mM and [B] = 13 mM. Calculate the ΔG of the reaction at the 1 hour timepoint. Please round to 1 decimal point.Gas constant = 8.315 J/mol Karrow_forwardWhich of the following correctly explains why the vapor pressure of water has to be included in the calculations? Some of the liquid water evaporates into the gas, and increases the total pressure generated by the trapped gas. As the H2(g) is bubbled up the reaction solution, some of the H2(g) molecules are solubilized by water in the aqueous solution, effectively decreasing the measured pressure above. The pressure contributed by the H2(g) is greater than the measured total pressure because of the contribution of partial pressure of water vapor. The pressure exerted by the evolved H2(g) is reduced because of the co-presence of water vapor, thus Pwater vapor has to be added to Pdry gas. Overview of the experiment:arrow_forwardThe reaction quotient is Q=1.6×10-26 Part B What pH is needed to produce this value of Q if the concentration and pressure values are [Br2]=2.50×10−4M , [Br−]=11.65M, [SO42−]=9.50M, and PSO2=3.50×10−5atm ? Express your answer numerically to two decimal places.arrow_forward
- 7. Sulfur hexafluoride, SF6(g), one of the densest known gases, is used to insulate electrical equipment, including high-voltage wires. Determine the enthalpy change of the reaction: (3 marks) 40 H2S(g) + 4 F2(g) → 2 HF(g) + SF6(g) Given the following 3 reactions: lotal SHOW 1) ½ H2(g) + ½ F2(g) → HF(g) A;H° = -273 kJ %3D ergy Chernists in en halpy is 2) 8 S8(9) + 3 F2(2) → SF6g) dencted 3) H2(g) + '/8 S8(s) → H2S(g) A:H° = -1220 kJ %3D unit of nge in mes h A;H° = -21 kJ mad) %3Darrow_forwardCO2 (g) + H20 () CH1206 () + 02 (g) (a) How many grams of sugar are produced from 1000g (one liter) of water? (b) How many liters of CO2 are needed to react with one liter of water?arrow_forwardA monoprotic weak acid, HA, dissociates in water according to the reaction HA(aq) = H+ (aq) + A¯(aq) The equilibrium concentrations of the reactants and products are [HA] = 0.220 M, [H+] = 3.00 × 10−4 M, and [A¯] = 3.00 × 10−4 M. Calculate the value of pKa for the acid HA. pKa =arrow_forward