UNIT 1 WORKSHEET #3 - Portage School's Moodle

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Problem 11. The average molar mass of lithium is 6.941. A sample of lithium consists of two isotopes with masses of 6.01512 amu and 7.01600 amu. Determine the percent abundance of each isotope. . 12. The molar mass of nitrogen (N 2 ) is 28.0 g/mole. What is the mass of a single nitrogen atom? . 13. A 1.45 g sample of chromium contains how many atoms? . 14. What mass of oxygen is present in 10.0 grams of carbon dioxide (CO 2 )? . 15. How many moles are present in 0.098 grams of HCl? . 16. How many atoms are present in 5.00 grams of iron? . 4
17. What is the percent composition of silicon nitride (Si 3 N 4 )? . 18. Beryl is a mineral which contains 5.03% Be, 10.04% Al, 31.35% Si, and 53.58% O. What is the chemical formula for beryl? . 19. Combustion analysis of 2.400 grams of toluene, an organic solvent, yields 8.023 g CO 2 and 1.877 g H 2 O. What is the simplest formula for toluene? . 20. Combustion analysis of 0.800 grams of an unknown hydrocarbon yields 2.613 g CO 2 and 0.778 g H 2 O. What is the percent composition of the hydrocarbon? . 21. Sodium metal and water react to form sodium hydroxide and hydrogen gas. What mass of Na will react with excess water to produce 15 g NaOH? 2Na(s) + 2H 2 O(l) → H 2 (g) + 2NaOH(aq) . 5
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UNIT 1 WORKSHEET #3 - Portage School's Moodle

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