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When the sun is directly overhead, the surface of the earth receives 1"4 x 10J W/m2 of sunlight. Assume that the light is monochromatic with average wavelength 500 nm and that no light is absorbed in between the sun and the earth"s surface. The distance between the sun and the earth is 1"5 x 10 " m.
(a) Calculate the number of photons falling per second on each square metre of earth"s surface directly below the sun.
(b) How many photons are there in each cubic metre near the earth"s surface at any instant ?
(c) How many photons does the sun emit per second ?
Identify the following molecules as an alkane, alkene, alkyne, alcohol, ether, thiol, aldehyde, ketone, carboxylic acid, ester, amine or amide. One term will not be used.
Compute the change in entropy for 0.5moles of an ideal gas with a temperature independent specific heat capacity of cp, m=2R that undergoes an irreversible change between each pair of states listed below.
If we wish to prepare a 0.50M solution of NaCl how much water must be added to 1.0 mole of NaCl?
Outline a complet mechanistic sequence for the reaction of 2-bromoheptane with potassium 2-methyl-2-propoxide in 2-methyly-2-propanol solvent to form the three alkenes generated in the reaction
A key oxidative step(s) in the B-oxidation cycle of fatty acids includes: a. addition of water to a double bond b. generation of a double bond from two adjacent -CH2 carbons
An equilibrium mixture of PCl5,PCl3 and Cl2 at a certain temperature contains 8.3×10^?3M PCl5 , 1.5×10^?2M PCl3 and 3.0×10^?2M Cl2.
First prepare a stock solution that is 1.00 x 10-2 M in phosphate ion. How many g of Na3PO4 would you add to a 100 mL volumetric flask to to prepare this solution. An what is the ppm of phosphate
a rotary drum filter with a filter area of 200 m2 and a vacuum pressure of 75 kpa is to be used to remove cells from a
Really struggling with this one dy/dt = 2t(y + 1) + 2at^3 where a is a parameter. Find the general solution of the ODE when a = 0 using the fact that it is separable. After this, use the fact that that it is a linear ODE to find an integrating fac..
If 11.5 kilograms of Al2O3(s), 50.4 kilograms of NaOH(l), and 50.4 kilograms of HF(g) react completely, how many kilograms of cryolite will be produced? What is the total mass of the excess reactants left over after the reaction is complete?
a 145ml of beaker with ch3cooh buffer with a ph of 5.000 is sitting on a bench top. the total molarity of acid and
Describe and explain the possible effect on your results of the following experimental errors or variations. in each case, specify the component(s) whose percentage(s) would be too high or too low
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