1. Which reaction most certainly results in a negative ASrxn? a. H₂O(g) b. CaCO3(s) H₂O(s) Cao(s) + CO2(g) c. CuSO, 5H2O(s) CuSO4(s) + 5H2O(g) d. 140, (g) + 3NH.NO,(s) + C10 H22 (→ 3N2(g) + 17H₂O(g) + 10CO2(g) e. CO₂(aq) CO₂(g)
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A: So, option (b) is correct.
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- Automobiles and trucks pollute the air with NO. At 2000.0°C, Kc for the reactionN2(g)+O2(g)2NO(g)At 2000.0°C Kc = 4.100 × 10–4 and ΔH° = 180.6 k What is the value of Kc at 89.00°C?What is Donnan's theory? What is its importance in biophysical chemistry?Carbon dioxide gas, CO2(g), is generated in the combustion of a sample of ethane (C2H6). This CO2 is all bubbled into aqueous barium hydroxide to be absorbed to produce 0.506 g of solid barium carbonate precipitate. How many grams of ethane (C2H6) were initially burned? The absorption-precipitation reaction is given by [CO2(g) + Ba(OH)2(aq) BaCO3(s) + H2O(l)].
- The results of your Solubility of a Salt experiment led to the following linear regression equation: ln(s)= -4197(1/T)+ 17.96 What is the heat of solution, ΔH, in kJ/mol? a. 25 b. 35 c. 45 d. 55In an Orsat analysis the % CO2 of the product of the combustion is 20% . If percent excess air is 30% . find the maximum percentage of CO2 attainable.Chemistry In an analysis of the content of carbohydrate present in a glycoprotein, the following results were found: 12.6, 11.9, 13.0, 12.7 and 12.5 g of carbohydrate per 100 g of protein. Taking into account that σ is unknown, the confidence interval for the average value at a 90% confidence level of the carbohydrate content is: Select one:to. 12.5 ± 0.4b. 12.5 ± 0.2c. 12.5 ± 0.5d. 12.5 ± 0.3
- At 32°C, liquid Glauber's salt – sodium surface decahydrate, Na2SO4 x 10H2O(I) – solidifies amd releases 78.0 KJ/mol of energy. Calculate the enthalpy change when 2.50kg of Glauber's salt enters the solid state.How would each of the following errors affect the determination of the molar mass of the unknown (Increase/Decrease/No effect)? a. Thermometer reads 2.0o higher than the true temperature. b. Some of the t-butanol was unknowingly spilled after it had been weighed but before the solute was added. 3. A student accidentally added acetylsalicylic acid (MW = 180.157 g/mol) rather than salicylic acid (MW = 138.121 g/mol), if no other mistakes were made, how would this error affect the determined molal freezing point depression constant for t-butyl alcohol (Kf)? 4. Based on the Tf and Kf you determined for t-butyl alcohol, predict the freezing point of a t-butyl alcohol solution containing 0.530 m NaCl. Assume 1.9 is the van’t Hoff factor for NaCl in t-butyl alcohol. Show your work.Chemistry 5 grams of cereal was crushed and dissolved in 25 mL water and placed in a dialysis bag. This sample was dialysed over a week in a beaker which contains 500 mL of water. 5 mL of the dialysate (an aliquote from the 500 mL) was separated to determine the glucose concentration. The glucose concentration was determined as 5 mM. Calculate the amount (% w/w) of glucose present in the cereal. Hint: The molecular weight of glucose is 180.
- Use the values of ΔHof to calculate the ΔHo for the following reaction: 4 AB3(g) + 5 C2(g) → 4 AC(g) + 6 B2C(g) Substance ΔHof in kJ/mol AB3(g) 55.8 C2(g) 0 AC(g) 200.5 B2C(g) -65.5The reaction SO2(g)+2H2S(g)⇌3S(s)+2H2O(g)SO2(g)+2H2S(g)⇌3S(s)+2H2O(g) is the basis of a suggested method for removal of SO2SO2, a pollutant that irritates airways causing coughing, from power-plant stack gases. The values below may be helpful when answering questions about the process. Substance ΔG∘fΔGf∘(kJ/mol)(kJ/mol) ΔH∘fΔHf∘(kJ/mol)(kJ/mol) H2O(g)H2O(g) −−228.6 −−241.8 H2O(l)H2O(l) −−237.1 −−285.8 SO2(g)SO2(g) −−300.4 −−296.9 SO3(g)SO3(g) −−370.4 −−395.2 H2S(g)H2S(g) −−33.01 −−20.17 S(s)S(s) 0 0 Assume that the partial pressure of sulfur dioxide, PSO2PSO2, is equal to the partial pressure of dihydrogen sulfide, PH2SPH2S, and therefore PSO2=PH2SPSO2=PH2S. If the vapor pressure of water is 24 torrtorr , calculate the equilibrium partial pressure of SO2SO2 (PSO2PSO2) in the system at 298 KK. Express the pressure in atmospheres to two significant figures. Kp= 8*10^15What is ΔSsurr for a reaction at 28.6 °C with ΔHsys = 38.9 kJ mol-1 ? Express your answer in J mol-1 K-1 to at least two significant figures.