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What is the empirical formula of a sample of iron-containing compound that is 22% iron, 50.2 oxygen and 27.8 chlorine by mass?
What is atmospheric pressure in atmospheres in Denver for heat of fusion=40.6kj/mol at 95 degee celsius
Liquid water and nitrogen monoxide gas are produced from the reaction of 22.7 grams of ammonia gas with 53 grams of oxygen gas. 36.0 grams of water were measured at the end of the reaction. What mas
For the reaction A --> B, the activation energy is Ea = 125 kJ/mol and the heat of reaction, H = 50 kJ/mol. What is Ea for the reverse reaction in kJ/mol?
Using equations, explain how a buffer functions. Buffers consist of a solution of a weak acid, HA, and its conjugate base, A, at high concentrations.
Manganese makes up 1.3 x 10-4 percent by mass of the elements found in a normal healthy body. How many grams of manganese would be found in the body of a person weighing 183 pounds?
What is the velocity of a first-order reaction when the reactant concentration is 6 x 10-2 M and the rate constant is 8 x 103 sec-1?
69.7 grams of a solute with a molecular mass of 2790 grams are dissolved in enough water to make 1.00 dm(3) of solution at 20 degrees C. What is the osmotic pressure of the solution?
Suppose that at a certain instant the volume is 200 ccs, the pressure is 80 kPa, and the pressure is increasing at a rate of 28 kPa/min. At what rate is the volume decreasing at this instant?
Use the Nutritional information on the food bag to calculate the calories per gram? How does this information compare to your information? How do you explain the discrepancy? How could you do the expe
The rate constant at 25°C is 2.4 10-21 L/mol·s. If 0.0200 mol of HI(g) is placed in a 1.0 L container, how long will it take for the concentration of HI to reach 0.0085?
A 0.692 g sample of glucose, C6H12O6, is burned in a constant volume, bomb calorimeter. The temperature change is measured at 1.80 degrees C. The calorimeter contains 1.05 kg and the "dry" calorimet
For the reaction CH4+202 yields co2+2H2o, how many moles of carbon dioxide are produced from the combustion of 100 grams of methane?
The bottom of a box has a surface area of 25.0 cm2. The mass of the box is 34.0 kilograms. Acceleration due to gravity at sea level is 9.80 m/s2. What pressure is exerted by the box where it rests?
In the laboratory a student named Georgia weighed 5.95 g of an unknown solid mixture containing benzoic acid, copper (II) sulfate, and sand. She added 15 mL of acetone to her sample and dissolved on
If the actual yield of iron is 650 g what is the percent yield? An iron ore sample contains Fe2O3 plus other impurities. What is the mass percent of Fe2O3 in the impure iron ore sample?
In one city, a balloon with a volume of 6.0 L is filled with air at 101 kPa pressure. The balloon in then taken to a second city at a much higher altitude. At this second city, atmospheric pressure
Distance between two consecutive peaks or troughs. Frequency () Number of waves per second that pass through a given point in space. How are frequency and wavelength related?
Theres just no way they could deal with that. He went on, Obviously, if you get drought indices like these, theres no adaptation thats possible.
Balance the equation and answer in terms of moles. The disinfectant hydrogen peroxide (H2O2) decomposes to form water and oxygen gas. How much O2 will result from the decomposition of 8.38 mol of h
The combustion of butane produces heat according to the equation 2C4H10(g) + 13O2(g) 8CO2(g) + 10H2O(l) H°rxn = -5,314 kJ/mol. What is the heat of combustion per gram of butane
Using Henry's law, calculate the molar concentration of {rm O_2} in the surface water of a mountain lake saturated with air at 20 ^circ {rm C} and an atmospheric pressure of 645 torr.
Change in heat content We write H = Hfinal - Hinitial or for chemical reactions H = Hproducts - Hreactants Given this equation, What sign is H for exothermic reactions? What sign is H for endothermic
The equilibrium constant, Kc, for the following reaction is 7.00E-5 at 673 k. Calculate Kp for this reaction at this temperature.
Explain how this model can be used to reduce the number of dangling bonds from 49 (unreconstructed) to 19 (constructed). B. Explain the origin of the name dimer adatom stacking fault.