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Quiz 2 - .zmg “€719 M~ J c How many grams of NaN3 are...

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Unformatted text preview: (.zmg. “€719! M~' J c How many grams of NaN3 are required to produce 1.2 In L has a density of 1 25 g/L? Quiz 2 1 Gem 151 \ 0 Tuesday, September 13, 2006 ’ g 1. There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br; molecules, and the mass of the Br; is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br; consists of three peaks. Mass (amu) 'Relative size 157. 84 .257 159.83 .500 / 161.83 .243 a. What is the origin of each peak (of wthnsiSt)? b. What is the mass of each isotope? c. Determine the average molecular mass of a Br; molecule. d. Determine the average atomic mass of a bromine atom. e. Calculate the abundance of the two isotopes. , m 5% L 67.5% 23%». lessees) '51. 3 13x32 \L 1.85 m“ a J anew) 1W“, 4 WM 2. Auto otiv wWhen sodium azide, NaN3, rapidly decompose component elements. i 4 i l \ 2NaN3(s) —-——> 2Na(s) + 3N;(g) MS a. How many moles of N; are produced by the decomposition of 1.8 mol of NaN3 b How many grams of NaN3 are required to form 14 0 g of nitrogen gas? 3 of nitrogen gas if the gas .- N“ 1i 22.11%} N. ‘ é; (\iiwblm'15d : 843093/1‘10177 M c' . . -' . $9.. 0 . . ‘43 {‘3 “a. 8 ‘“°\c/ 1390001 glmd . EU? "9) {2353 2MB . 94% , <3 1st 1 2.79513 £13 ‘ ‘ L1 23 Ll 7 2 RNA 13“» : 1H 3 ...
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