Transcription of PLEASE NOTE THE FOLLOWING - Bates College
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PLEASE NOTE THE FOLLOWING - Bates College
CHEMISTRY WORKED-OUT ANSWERS TO HOMEWORK 6e. PLEASE NOTE THE FOLLOWING : a. Conversions of moles to grams or grams to moles always use molecular weights. b. Conversions that change moles of one substance to moles of another are always based on a balanced equation. When using such an equation, say to yourself, for every so many moles of one thing, there are so many moles of another. For example, in problem 1, for every 2 moles of SO2 , you need 2. moles of H2S and 3 moles of O2 . Watch how these ratios show up in the problems below. 1. Hydrogen sulfide burns by combining with atmospheric O2 to form sulfur dioxide and water vapor. BALANCED EQUATION: 2 H2S + 3 O2 ----- > 2 SO2 + 2 H2O. a. If I produce 200. g of sulfur dioxide, how much hydrogen sulfide did I start with? Molecular weights: H2S = * 2 + = ; SO2 = + 2 * = 200. g of SO2 * ( 1 mole of SO2 ) * ( 2 moles of H2S ) * ( g of H2S ).
PLEASE NOTE THE FOLLOWING: a. Conversions of moles to grams or grams to moles always use molecular weights . b. Conversions that change moles of one substance to moles of another are always based on a balanced equation . When using such an equation, say to yourself, “for every” so many moles of one thing, there
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