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1: What is the formula that relates the temperature change obsereved in a substance with the energy released or abosrbed?
2: when you measure a temperature rise during a chemical reaction, is the reaction endothermic or exothermic?
3: The enthalpy of the reaction for the reaction of calcium oxide with hydrochloric acid is exothermic. Will the reverse reaction have a positive or negative delta H?
4: Hess's law allows us to combine reactions to determine the heat of reaction for a net reaction that has not been measured. For the reactions described in the lab, the second reaction is difficult to measure as written. You will measure the heat of reaction for the reverse reaction. How will you use the measurment in the Hess's law calculations?
5: In part A of this lab you are reacting approximately 0.5g of Mg. In part B, you are directed to use a molar equivalent of MgO for the reaction. What is the molar equivalent of MgO when comparing to 0.5g Mg? Can you think of any reasons why this might be important?
The solubility of oxygen gas in water at 25°C and 1.0 atm pressure is 0.041 g/L. What is the solubility of oxygen in water at 8.4 atm pressure?
calculate the volume of air at 30 degrees celcius and 1 atm that is needed to burn completely 10 grams of propane. assume that air is 21 percent oxygen by volume
The sulfur and hydrogen in the fuel are completed oxidized to SO2 and H2O. 8% of the carbon is oxidized to CO, and the balance forms CO2. Calculate the dry basis mole fractions of the flue gas
A solution is made by mixing 50.0 ml of a HCl (aq) solution which has a pH of 3.00 with 50.0 ml of a KOH solution which has a pH of 12.00.
A 270- flask contains pure helium at a pressure of 761 . A second flask with a volume of 455 contains pure argon at a pressure of 730 . If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of ..
A multiple stage evaporate process concentrates a weak solution of LiOH from 4.48 wt% to 26.78wt%. This evaporator processes 10 metric tonnes of solution each day.
Calculate the molar mass of the uknown compound. The boiling point elevation constant for water is0.52°C/m
A sample of Oxygen is collected in a 206 mL container over water at 15C, and the barometer reads 793 torr. What volume would the dry gas occupy at 704 torr and 15C? Water's partial pressure at 15C is 12.8 torr. Answer in units of mL.
explain the earodynamics characteristics of margarine firmness and coefficient of friction important in agricultural engineering research and development.
8.0 moles of CO2 and 9.0 moles of H2O are places in a 5.0L vessel. When equilibrium is established, [C2H4]=0.45 M. Calculate Keq
what is the theorectical yield of disulfure chloride? what mass of the excess reactant reamains when the reaction is completed?
95.0 mL of H_2O is initially at room temperature (22.0C). A chilled steel rod at 2.0C is placed in the water. If the final temperature of the system is 21.5C, what is the mass of the steel bar?
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