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Calculate the amount of heat evolved in the oxidation of 32.0 g of Fe (Ar = 55.85 g/mol) at 25 oC and 1 atm pressure ( ΔHfo(Fe2O 3,s) = -824kJ/mol)
500cm3 of 0.250M of na2so4 is added to an aqueous solution of 15.0g of BaCl2 resulting in a white precipitate of insoluble BaSO4. how many number of moles and how many gram of BaSO4 are formed?
A space station, in the form of a wheel 115 m in diameter, rotates to provide an "artificial gravity" of 3.20 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of ro
Calculate the equilibrium constant, Kc, she obtained for this reaction. A student ran the following reaction in the laboratory at 689 K
An airline passenger dangles her watch from a string while the jet takes off. The string makes an angle of 25o with respect to the vertical while the aircraft accelerates for takeoff, which takes ab
Rhodopsin is a biological pigment that serves as the primary photoreceptor in vision. The chromophore in rhodopsin is retinal, and the absorption spectrum of this species is centered at roughly 500.
Which half-reaction represents reduction?
At a physiological temperature of 37 C, what is the probability of rhodopsin populating the first excited state? How susceptible do you think rhodopsin is to thermal population of the excited state?
The other fails to wash the boiled cabbage with water as directed. How will the determined amounts of vitamin C per gram of boiled cabbage compare?
A small ball rolls around a horizontal circle at height y inside a frictionless hemispherical bowl of radius R. Find an expression for the ball's angular velocity in terms of R, y and g. Q1) Find a
Nitrogen (80 kPa), oxygen (21.0 kPa), carbon dioxide (0.03 kPa), and water vapor (2.0 kPa) are the usual atmospheric components. What is the total atmospheric pressure in kPa?
How many kilojoules of heat are absorbed when 7.10g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure?
An unknown gas effuses at a rate of 86.6 mmol/hr. Under similar conditions, I2 effuses at a rate of 30.4 mmol/hr. What is the molar mass of the compound?
Suppose that 28 of gold is initially at 29.0. What is the final temperature of gold upon absorbing 2.45kJ of heat?
A car is traveling 80 km/hr in a school zone. A police car starts from rest just as the speeder passes it and accelerates at a constant rate of 8 km/hr·s. When does the police car catch the speeding
What safety, environmental, and economic considerations would be important to a company manufacturing 1 million pounds of aspirin each year by this procedure? Which ones are most important?
Three equal point charges, each with charge 1.45 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.250 m. What is the electric potential energy U of the system?
What is the percentage yield of SO3 if 22.3 g SO3 are obtained from the reaction of 25.0 g SO2 with an excess of O2?
Draw all stereoisomers of 2,3,4-tribromopentane. You should find two meso structures and one pair of enantiomers. Use bold and hashed wedges to show the stereochemistry.
What are some reasons why there would be a difference between the expected and actual values for the moles of copper oxide produced from heating copper in the air?
A simple harmonic oscillator consists of a block of mass 2.40 kg attached to a spring of spring constant 160 N/m. When t = 3.00 s, the position and velocity of the block are x = +0.129 m and v = +3.
Calculate the pH at 25 degrees celsius of a solution prepared by adding 50 mL of 1.60 M NaOH solution to 0.5 of .0850 M HC5H3O3.
How many carbons does a fatty acid typically have? Are there ever double bonds present? If so, what isometric conformation are they normally in (cis or trans)?
Given that 10.40 mL of NaOH is required to react completely with 20.0 mL of 0.200 M KHP solution, what is the concentration of the NaOH solution?