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lect_9oct15f08

# lect_9oct15f08 - Outline 9 1 Review Formulas 15-OCT-2008...

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1 Outline 9 15-OCT-2008 1. Review- Formulas Get mole ratios 2. Writing Chemical Equations Steps, Examples 3. Chem. Eqns. & Moles - Stoichiometry Examples

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2 Name________ Quiz 8a Lab Section_____ Given: A tungsten oxide sample has a mass of 5.34 g and contains 4.23 g tungsten (W, 183.84 g/mol). The rest is O (16.00/g/mol). 1. (2) Find moles of W atoms. 2. (2) Find moles of O atoms. 3. (1) Find mole ratio of O to W.
3 Name________ Quiz 8b TA Name______ ( Lab Sec.____) 1. Given: Compound contains 0.039 mol Fe atoms to 0.052 mol O atoms (a) (2)Find mol ratio of O to Fe atoms (b) (1) Write empirical formula 2. Given: N 2 + O 2 N 2 O 3 (2) Balance the equation with integer coefficients. Show steps.

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4 Chem Eqns: Writing & Balancing 1 . Write skeleton equation: formulas in format of reactants → products 2. Balance atoms Start with most complex substance. End with least complex substance. (Often do O & H last.) (Can use fractions such as (1/2) O 2 ) 3. Adjust coefficients to get integers. 2*(1/2) O 2 = O 2 4. Double check 5. Provide states (g), (l) , (s), (aq)
5 Chem. Eqns: Balancing Balance the following equations. Use slide 4. Chalk or

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