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Why is the method of standard addition or internal standards used in chemical analysis? What is the difference between the two?
the second line of the balmer series occurs at a wavelength of 486.13 nm. what is the energy difference between the
A coordination complex is found by study to contain 21.79Co,18.90 NH3, and 39.32 Cl. Presume the remainder, if any, is water. Explain what is the empirical formula for this coordination complex
The heat fusion of pure silicon is 43.4 kJ/mol. How much energy would be needed to melt a 5.24 - g sample of silicon at its melting point of 1693 K?
If 2.5 mol of ethylene oxide are decomposed at 93 degrees C, what will be the final temperature of the products? The heat capacity of the products is 110.13 J/ molC.
A 55.0 mL solution of 0.155 M iron (III) perchlorate is prepared. This solution is then titrated with 27.6 mL of 0.250 M potassium hydroxide. What is the concentration of iron (III) perchlorate that remains in the solution
when al metal reacts with hbr aluminum bromide and hydrogen gas are formed. if you started with 3.75 g of aluminum and
What is the molarity of a 50% (by mass) NaOH. How did you find this value? Using this molarity, show that 13ml of 50% by mass NaOH diluted to 2200ml with distilled water yields a solution that is about 0.1M NaOH.
What is the longest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
what is the change in pH after addition of 10.0mL of 1.0M sodium hydroxide to 90.0mL oof a 1.0M NH3/1.0M NH4+ buffer? (Kb for ammonia is 1.8 X 10-5)
Calculate the energy of a photon of electromagnetic radiation at each of the following frequencies 104.9 MHz 1090. kHz 838.7 MHz express answer in joules using four significant figures
Determine the number of moles of P4O10 required to produce 4.70 moles of phosphoric acid.
What is the purpose of decalin when heating an alcohol with strong acid to produce an alkene
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