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# SG+chem+130+wks+for+ch+3 - 8 If empirical formula is CH2O...

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Monday 9/25/06 Study Group for Chem 130 – Review for Chapter 3 Overview Moles Mass Relationships Empirical Formulas Molecular Formulas Stoichiometry Percent Composition Limiting reagent Problems 1) Calculate the formula weight of: a) CHCl3 b) Iron (III) sulfate 2) What is the mass in grams of an oxygen atom? 3) What is the mass in grams of a water molecule, H2O? 4) Convert 45.6g of PBCrO4 to moles. 5) How many molecules are there in a 5.26 g sample of HBr? 6) Calculate mass percentages of elements in formaldehyde, CH2O. 7) Determine empirical formula of compound when it weights 1.587g, and is found to contain .483 g N and 1.104 g O.
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Unformatted text preview: 8) If empirical formula is CH2O, what is the molecular formula? MW = 60 amu 9) Fe2O3 + 3CO 2Fe + 3 CO2 How many grams of iron can be produced from 1.00 kg Fe2O3? 10) Zn+2HCl ZnCl2+H2. If .3 mol Zn is added to HCl acid containing .52 mol HCl, how many moles of H2 are produced? 11) How many cm are there in 6.51 miles? (1 mi=5280 ft, 1 ft=12 in, 1 in=2.54 cm) 12) What is the nuclide symbol for a nucleus that contains 38 protons and 50 neutrons? 13) What is the formula for Chromium (III) oxide? 14) Balance H3PO3 H3PO4 + PH3....
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