chem3 - 6. Determine the molar mass of this compound in...

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1. How many atoms of H are present in 2.56 moles of NH 3 ? 2. The hypothetical element, Az, has three stable isotopes. The isotopic abundances and masses of the three isotopes are: Isotopic Abundance(%) Mass (amu) 11.02 104.034 45.06 107.173 43.92 111.817 From this information, determine the atomic weight of the element Az in amu 3. Determine the percent composition, to three significant figures, for each element in this compound. Be certain that you enter your answer as a percentage. Cu(VO 3 ) 2 4. How many atoms of K are present in 3.74 moles of K? 5. Balance the following chemical equations with the smallest whole numbers. (Enter "1" if a coefficent is one). FeO + O2 -> Fe2O3 Eu + HF -> EuF3 + H2
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Unformatted text preview: 6. Determine the molar mass of this compound in g/mol. (NH 4 ) 2 SO 3 (33%) 7. How many moles of (NH 4 ) 2 SO 3 are present in 44.9 g of (NH 4 ) 2 SO 3 ? (33%) 8. How many H atoms are present in 44.9 g of (NH 4 ) 2 SO 3 ? (34%) 9. How many moles of Zn(NO 2 ) 2 are there in 112.20 g of sample? How many O atoms are there in the sample? 10. The hypothetical element, Z, consists of two stable isotopes. The first stable isotope, 42 Z, has an actual mass of 42.2510 amu. The second stable isotope, 45 Z, has an actual mass of 44.6615 amu. The atomic wieght of element Z is 43.9036 amu. What are the isotopic abundances of the two stable isotopes?...
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This note was uploaded on 04/27/2008 for the course CHEM 1311H taught by Professor Robinson during the Spring '07 term at University of Georgia Athens.

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chem3 - 6. Determine the molar mass of this compound in...

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