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The 650 nm/590 nm intensity ratio for tetraphenylchlorin is 7, while the ratio for tetraphenyl porphyrin is .45. Predict the 650 nm/590 nm intensity ratio for a sample that contains 98% tetraphenylporhyrin and 2% tetraphenylchlorin.
chromium oxide is made by reacting Na2Cr2O7 with ammonium chloride to make chromium III oxide, sodium chloride, nitrogen and water.
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 4 to n = 1. I need an explanation of the formula too.
how many grams of sodium formate nacho2 must be added to 750.0ml of .250 m of formic acid hcho2 to obtain a buffer with
Cinnamon gets some of its flavor from cinnamaldehyde that is 81.79% C; 6.10% H and the rest is oxygen. Determine the empirical formula for this compound (enter your answer in the form CxHyOz)
In the reaction 2-phenylacetic acid + ethanol in a H2SO4 solution yields Ethyl-2-phenylacetate, (a) which group in the acyl compound is being substituted and (b) what is the substituting group?
7.50 mL of 0.125 M HCl is added to the 100.0 mL of the buffer solution. Calculate the new [NH3] and [NH4Cl] for the buffer solution. Calculate the new pH of the solution.
1. How many CO2 molecules are needed to produce 1 glucose molecule (in photosynthesis)? 2. How many moles of oxygen atoms are in 1 mole of calcium phosphate?
Use simple structure and bonding models to account for why phosphorus forms 2 chlorides (PCl3 and PCl5) while nitrogen forms only 1 chloride (NCl3).
A 0.250 mol sample of argon gas has a volume of 9.00 L at a pressure of 875 mm Hg. What is the temperature (in celsius) of the gas?
how many grams of the compind potassium chloride must be dissolved in 200 grams of water to make a saturated solution at 60 C.
what does it mean to say that the ions of an electrolyte behave independently of one another when the electrolyte is
53.5 g of an ideal gas of molecular weight = 10.5 g/mol is confined at a pressure of 50 kPa. The density of the gas is 0.164 g/L. Compute the temperature of the gas in degrees Celsius.
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