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How many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 {rm nm} for solar radiation.
The background section describes why you want the bleach to be far in excess of the dye. State how much greater the bleach should be to be considered in large excess. If the due is 1 x 10-5 M how mu
Consider the reaction. How much CaCO3 is produced if 47.5 moles NH3 are produced?
If 5 moles of propane and 10 moles of oxygen are sealed in a container and burned, which reactant will be the limiting reactant, and how many moles of carbon dioxide will be produced?
The initial volume of a sample of argon gas is 938 mL at 178°C. If the pressure is held constant and the volume is changed to 427 mL, what will be the new temperature (in °C)?
Find the Density of a substance with a mass of 51.2g and a volume of 150mL
A line in the emission spectrum of an atom occurs at a wavelength of 560 nm. What is the energy difference between the two energy levels involved in this emission.
The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of the
What mimimum hydronium ion concentration (M) would be needed to prevent precipitation of cupric hydroxide (Cu(OH)2 <=> Cu2+ + 2OH- , Ksp = 2.2 x 10-20) from a solution containing 0.010 M Cu2+
Calculate the minimum concentration of Cr3+ that must be added to 0.095 M NaF in order to initiate a precipitate of chromium(III) fluoride.
1.770 g of a solid white acid are dissolved in water and completely neutralized by the addition of 36.96 mL of 0.437 M NaOH. Calculate the molar mass of the acid, assuming it to be a monoprotic acid
The uncertainty B in some observable B is given by a formula B=sqrt<B^2>-<b>^2. Use this formula to determine uncertainty in position and momentum for the ground state of a quantum mech
MgNH4PO4.6H2O loses H2O stepwise as it is heated. Between 40c and 60 the monohydrate is formed, and above 100 celcius the anhydrous material is formed. What are the phosphorus percentage of the mono
In the first 12.0 s of the reaction, 1.8×10-2 moles of O2 is produced in a reaction vessel with a volume of 0.260 L. What is the average rate of the reaction over this time interval?
A weather balloon has a volume of 750 L when filled with helium at 8 oC at a pressure of 380 torr. What is the new volume of the balloon when the pressure is 0.20 atm and the temperature is -45 oC?
Determine the amount of food you must consume to reach an LD50 exposure, when the concentration of Red Dye #40 in the food is 5.283x10^-4mol/L. Given that LD50=mg/kg and a human weighs 60kg.
Select the element potassium (K). Give the wavelength, in Ångströms, the frequency, and the energy of the broadest purple emission
100g of water (specific heat=4.184 J/g*C) and 100g of a metal sample (specific heat=0.397 J/g*C) are heated from 25 degrees celcius to 75 degrees celcius. Which substance required more thermal energ
How many grams of sodium lactate should be added to 1.00 L of 0.150 lactic acid (or) to form a buffer solution with = 4.10? Assume that no volume change occurs when the sodium lactate is added.
At a certain temperature and pressure, 1.7 L of N2 reacts with 5.1 L of H2. If all of the N2 and H2 are consumed, what volume of NH3(g) is produced at the same temperature and pressure?
What mass of sucrose should be combined with 541 of water to make a solution with an osmotic pressure of 8.30 at 295 ? (Assume the density of the solution to be equal to the density of the solvent.)
When 25.0 ml of 0.500M H2SO4 is added to 25.0ml of 1.00M KOH IN A COffee cup calorimeter at 23.5 degrees Cel, the temperature rises to 30.17 degrees cel. Calculate delta H of this reaction.
At t = 1.00 min, the concentration of starch has decreased to 0.028 %. Compute the average rate of disappearance of starch. Specify your answer in units of % starch/min.
Calculate the heat required to raise the temperature of 0.850 mole of this compound from 298K to 400K at a constant pressure of 1 atm.
The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes to propene in 79.0 min. Determine the rate constant for this reac