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- One method of generating electricity is by burning coal to heat water, which produces steam that drives an electric generator. To determine the rate at which coal is to be fed into the burner in this type of plant, the heat of combustion per ton of coal must be determined using a bomb calorimeter. When 1.00 g of coal is burned in a bomb calorimeter (Figure 5.17), the temperature increases by 1.48 °C. If the heat capacity of the calorimeter is 21.6 kJ/°C, determine the heat produced by combustion of a ton of coal ( 2.000103 pounds).This was a lab I performed where we mix aqueous 25ml HCl and 25ml NaOH and use a program called microlab to determine the cooling rate after the initial heating. We used a coffee cup calorimeter that had a stirring bar. At first, NaOH solution is by itself in the coffee cup calorimeter. It’s temperature was 23.02 C. I waited for 70 seconds and then added the 25ml of HCl to it. The temperature rose to 29.59 C, then began to cool down immediately. The cooling rate was y=0.0089x+26.1273 according to the program. The final weight of the solution was 47.147g. The moles of NaOH was 0.919M and HCl was 1.033M. The question: Using the volumes and concentrations of the HCl and NaOH solutions used in the experiment,calculate the moles of H2O formed in the neutralization reaction.Consider a simple mass balance model where 100 CO2 molecules are released into the atmosphere from burning fossil fuels. Half of these molecules are immediately absorbed by the terrestrial biosphere and ocean: fraction f goes to the biosphere and fraction 1-f dissolves into the ocean. Assume fossil fuel combustion consumes 1.4 molecules of O2 for every molecule of CO2 produces and photosynthesis produces 1.1 molecules of O2 for every molecule of CO2 consumed. If the observed change in oxygen is a decrease of 110 molecules, what fraction of the CO2 was absorbed by the ocean.
- This was a lab I performed where we mix aqueous 25ml HCl and 25ml NaOH and use a program called microlab to determine the cooling rate after the initial heating. We used a coffee cup calorimeter that had a stirring bar. At first, NaOH solution is by itself in the coffee cup calorimeter. It’s temperature was 23.02 C. I waited for 70 seconds and then added the 25ml of HCl to it. The temperature rose to 29.59 C, then began to cool down immediately. The cooling rate was y=0.0089x+26.1273 according to the program. The final weight of the solution was 47.147g. The moles of NaOH was 0.919M and HCl was 1.033M. The questions: calculate the theoretical value for change in delta Hrxn.A 150-g sample of copper is heated to 500 oC. When it is plunged into 700 g of water at 20 oC it is noted that 10 g of water immediately flashes to steam and leaves the system. Neglect any effects from the calorimeter. a) Determine the final temperature of the system less the escaped vapor. (Assume all the water to steam conversion takes place at 20 oC.) b) What would the final temperature have been if no water were converted to steam?Determine the temperature of the combustion product of 1 L of bioethanol if the heat from the combustion is taken or absorbed by the heat-taking medium for the HHV value!
- CH) + 2 Ozie) - COz) + 2 Hy0 72 C,H20tn + 14 O) - 9 CO2) + 10 H;0 C,H12n + 8 Oz) 5 COn + 6 H2Ou C,H1suh + 11 Oze) → 7 COxe) + 8 H20u The heat of combustion is the energy liberated when a substance undergoes complete combustion, at constant pressure usually in an environment with excess oxygen. Which among the following combustion reactions yields the highest thermochemical energy? * C,H16() + 11 O2e) 7 CO2e) + 8 H20n CSH12) + 8 O28) - 5 CO2 + 6 H20) C9H20(1) + 14 O2g) 9 CO2) + 10 H20n Scree CH48) + 2 Oe) CO2ie) + 2 H20 2(g) The s Onera dry natural gas consists of (60 gm methane, 20gm ethane, 15,gm propane, 8 gm I. Butane, 4 gm N.Butane). Find the heating value of this gas, then find it volume in unit of(scf).To calculate the heat of combustion of naphthalene with calorimetric bomb, first the heat capacity of the calorimetric bomb is calculated. a) As a result of the burning of 1 g of Benzoic acid, a temperature rise of 2.63oC and a temperature of -3234.7 kJ / mol was released. Find the heat capacity of the calorimetric bomb. b) 6.4oC temperature difference was calculated as a result of burning 5 g of Naphthalene. Calculate the combustion temperature of naphthalene. (Molar mass of naphthalene: 128.17 g / mol)
- What is the use of burnt length of fuse wire in bomb calorimetry? Why is it subtracted to get the heat flow in a bomb calorimeter?The following data set will be used in several questions about an unknown mixture of sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3). The following data set and reactions will be used in several questions about an unknown mixture of sodium carbonate (Na₂CO3) and sodium bicarbonate (NaHCO3). Data Table Mass of empty porcelain dish Mass of unknown mixture Mass of dish after 1st heating Mass of dish after 2nd heating Mole fraction of sodium carbonate ?? 2NaHCO3 (heating) >>> CO₂ + H₂O + Na₂CO3 Na₂CO3 (heating) >>> Na₂CO3 Given the information above, what is the mole fraction of sodium carbonate in the unknown mixture? 0.789 0.642 0.598 mass (g) 47.320 0.9460 48.185 48.145 0.367 0.402neutralization of 0.28M 18 mL sodium hydroxide with 0.5 mL nitric acid of 42% at the end of the reaction, a temperature increase of 15 °C was observed and the heat value was 825 cal it is determined. According to these results; a) The number of moles of the neutralized base is b) The enthalpy of reaction is c) The constant of the calorimeter in terms of water is www (d(HNO3)= 1.51g/mL; M(HNO3)=63.01 g/mol) www.w According to the enthalpy value, the reaction is
