tutorial 3 - impurities by weight What mass of lead is...

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Chemistry 1R03 Tutorial #3 - Questions 1. Consider the following reaction: 2NO + Br 2 2NOBr For every 3.00 mol of bromine that reacts, how many moles of NO react and how many moles of NOBr are produced? 2. Consider the reaction of hydrogen gas with chlorine gas to produce hydrogen chloride. How many grams of chlorine are required to completely react with 3.18g of hydrogen gas? 3. In the following unbalanced reaction: Fe 3 O 4 + H 2 Fe + H 2 O 7.5g of water was produced. How many grams of iron oxide reacted? 4. What mass of potassium can be produced by reacting 100.0g of Na with 100.0g of KCl? Na + KCl NaCl + K 5. A reaction mixture contains 25.0g of PCl 3 and 45.0g of PbF 2 . What mass of PbCl 2 can be obtained from the following unbalanced reaction? PbF 2 + PCl 3 PF 3 + PbCl 2 6. A particular ore of lead, galena, is 10% lead sulfide, PbS, and 90%
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Unformatted text preview: impurities by weight. What mass of lead is contained in 75 grams of this ore? 7. Adipic acid (MW 146.1 g/mol) is used to make synthetic fabrics. It only contains C, O and H. Combustion of a 1.6380g sample gives 2.960g of CO 2 and 1.010g of H 2 O. What is the empirical and molecular formula for adipic acid? 8. Timolol is used to reduce the need for heart bypass surgery. Its composition is 47.2% C, 6.44% H, 13.0% N, 25.9% O and 7.43% S. The mass of 0.0100 mol of timolol is 4.32g. What is the empirical and molecular formula? 9. A solution is 25% (m/v) NaOH. What volume of water is needed to dissolve 16.23g of NaOH to obtain this concentration? 10. What is the concentration (in % v/v) if 1.5 mL of acetic acid is dissolved in 30.0 mL of water?...
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