lecture21 - Midterm II Review Chem 1P Lecture 21:...

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Unformatted text preview: Midterm II Review Chem 1P Lecture 21: calculator Midterm II When : Friday November 19 @ 2:00 pm Where : PSLH 100 Bring: Index card Bring Not: Cell phone paraphernalia calculator Midterm II When : Friday November 19 @ 2:00 pm Where : PSLH 100 Bring: Index card Bring Not: Cell phone paraphernalia Midterm II Review What will be on the 2 nd Midterm? Acid-base reactions Mass percentages Moles and mass Empirical and molecular formulas Balancing chemical equations mainly lecture material, use book as a reference Limiting reagents Aqueous solutions Molarity Precipitation reactions Moles and mass 1 mol = 6.022 x 10 23 Molar mass 1 mol amu = 1 g 1 mol of beta carotene (C 40 H 56 ) is: 40 x 12.01 + 56 x 1.008 = 536.85 g From moles to mass: Amount (moles) x 1 mol Molar mass = amount (grams) From mass to moles: Amount (grams) x Molar mass 1 mol = amount (moles) Mass percentages Mass percent = mass of atom in 1 mol compound mass of 1 mol compound x 100% What are the mass percentages of the different atoms in sorbitol? C 6 H 14 O 6 Mass % O: Mass % H: Mass % C: Midterm example 182.17 g 6 x 12.01 g x 100 % = 39.56 % 182.17 g 14 x 1.008 g x 100 % = 7.75 % 182.17 g 6 x 16.00 g x 100 % = 52.70 % Total = 100.01 % Determining molecular formula 1. Use the mass percentages and the molar mass to determine the mass of each element in one mole of compound....
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lecture21 - Midterm II Review Chem 1P Lecture 21:...

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