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Question - The radiation emitted in the transition from n=3 to n=2 in a neutral hydrogen atom has a wavelength of 657 nm. What would be the wavelength of radiation absorbed in the transition from n=1 to n=3?
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By mass spectral analysis, a sample of strontium is known to contain 2.64x1010 atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life ..
m is a metal x is a non-metal. upon strong heating of 0.5000g of mxo3s it decomposes forming mos and xo2g. then all of
A solution of chloroform (CHCL3) in carbon tetrachloride (CCL4) is 1.87 molar chloroform and has a density of 2.93 grams/mL. Calculate
Explain what quantity of excess reactant remains when 4.80 moles of Fe reacts with 3.93 moles of O2. 4Fe + 3O2 Æ 2Fe2O3
when 3-methyl-1 5-pentanediol is warmed with polyphosphoric acid the major product has a molecular formula c6h12o. what
Problem- An aqueous solution containing 5.35 g of an optically pure compound was diluted to 700.0mL with water and placed in a polarimeter tube 10.0 cm long. The measured rotation was -5.15° at 25 °C.
Explain how these products are produced by showing the mecahnism involved. (draw).
what is the minimum number of Kilo Joules needed to change 40 grams of water 100 C to steam at the same temperature and pressure?
dissolved .31 grams of KHP in 25 ml of water and it required 15.5ml of NaOH to reach end of titration, how many moles of KHP were originally present before the addition of the NaOH?
An unknown metal hypochlorite salt, M(ClO)2, is subjected to analysis by iodometric titration: the salt is dissolved in dilute sulfuric acid, treated with excess aqueous KI,and then titrated with Na2S2O3.
Nitrogen monoxide is produced by combustion in an automobile engine. According to the following reaction, how many moles of oxygen gas are necessary to form 0.285 moles nitrogen dioxide
calculate the expected ph of a 25.0 ml solution of 0.200 m acetic acid that is being titrated with a 0.100 m solution
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