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What is the total energy, in kJ, needed to raise 20 g of CH4O (methanol) from - 120 °C to 100 °C? Show your work.
Assuming each quadrant of the pizza to be the same, find the center of mass of the uneaten pizza above the axis (that is, the portion of the pizza in the second quadrant). Find the -coordinate.
or a certain reaction, kc=2.2*10^_4 and kf=0.284 M^-2 *s^-1. Calculate the value of the reverse rate constant, kf, given that the reverse reaction is of the same molecularity as the forward reactio
A solution is prepared by diluting 225 mL of 0.1885 M aluminum sulfate solution with water to a final volume of 1.450 L. Calculate the number of moles of aluminum sulfate before dilution.
How do I calculate the volume of dry hydrogen gas would occupy at STP. (use the combined gas law). The mass of pure magnesium is 0.030g
What is the maximum weight that a single thread of this silk could support?
Using Half Reactions, Write a balanced Oxidation-Recuction reaction. Oxidation of 1 to 12, and reduction of Mn02 to mn2+
Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2. By what factor does the rate change if the concentration of BrO3- is tripled and that of Br- is is decreased by a factor of 3? Jus
A person pulls a toboggan for a distance of 34.8 m along the snow with a rope directed 32.2 degrees; above the snow. The tension in the rope is 91.5 N. (a) How much work is done on the toboggan by t
The temperature difference between these points was divided into 50 units (called X), what would be the freezing and boiling points of water in X?
What is the reaction order of H+ for a reaction with the following rate law?
The first order reaction A ---> Products has a half life of 46.2 minutes at 25C and 2.6 minutes at 102 C. Calculate the activation energy for this reaction.
The pressure of a gas contained in a cylinder with a movable piston is 450 Pa (450 N/m2). The area of the piston is 0.2 m2. What is magnitude of the force exerted on the piston by the gas?
Calculate the mass of propylene glycol (C3H8O2) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.87 torr at 40 Degrees Celcius ( PH2O at 40 Degrees Celcius = 55.3 torr).
A mole of photons is called an einstein. Calculate the radiant energy of an einstein if the photons have a wavelength of 608.7 nm.
Calculate the average power output per pulse of a laser that produces 3.0 J in a 1.0-ps pulse. If the laser operates at 480 nm how many photons are produced in a pulse?
Question: An AC Series circuit has 12.0 ohms resistance, 15 ohms inductive resistance and 10 ohms capacitance resistance. if effective rms (emf) of 120V is applied what is the Poiwer output?
When a 0.133 g sample was studied by combustion analysis, 0.239 g of CO2 and 0.0323 g of H2O formed. How many moles of each of the following were in the original sample?
A 43-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 230 J from 420 J. How high does she rise during this
Joe is making a 0.0053 Molar sulfuric acid (H2SO4) solution in the lab. How many grams of pure sulfuric acid is needed to be used if he is trying to make 250 mL total of solution?
A first order decomposition reaction has a half-life of 43.3yr. What is the rate constant of the reaction in yr-1? (give answer to 3 sig figs using E notation)?
A chemist puts hot water extract of caffeine in to an ice bath and some crystallizes. Is the remaining solution saturated unsaturated or supersaturated and why?
Why Metals easily lose their electrons, and nonmetals gain electrons?
Which of the following would be a reasonable unit for the rate constant of a first order reaction?
Question: The angular momentum of a spinning wheel is 230 kg · m2/s. After application of a constant braking torque for 2.1 s, it slows and has a new angular momentum of 119 kg · m2/s.