Magnesium has three stable isotopes. The most commonly occurring isotope, 24 Mg, has an isotopic mass of 23.985 u and makes up 78.99 % of naturally occurring magnesium atoms. The isotope 25 Mg makes up 10.00 % of magnesium atoms and has an isotopic mass of 24.986u. The isotope 26 Mg makes up 11.01 % of magnesium atoms and has an isotopic mass of 25.983 u. Using the isotopic composition provided, calculate the average atomic mass of magnesium.
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Chemistry, 22.06.2019 10:50
A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.
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Chemistry, 22.06.2019 14:10
13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.
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Magnesium has three stable isotopes. The most commonly occurring isotope, 24 Mg, has an isotopic mas...
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