Chapter 13
Chemical Principles: The Quest for Insight · 3 exercises
Problem 7
Te analysis of \(0.922 \mathrm{~g}\) of aniline, a common organic base used in some varnishes, is \(0.714 \mathrm{~g} \mathrm{C}\), \(0.138 \mathrm{~g} \mathrm{~N}\), and the remainder hydrogen. What is the empirical formula of aniline?
6 step solution
Problem 8
Urea is used as a commercial fertilizer because of its nitrogen content. An analysis of \(25.0 \mathrm{mg}\) of urea showed that it contained \(5.0 \mathrm{mg} \mathrm{C}, 11.68 \mathrm{mg} \mathrm{N}\), \(6.65 \mathrm{mg} \mathrm{O}\), and the remainder hydrogen. What is the empirical formula of urea?
4 step solution
Problem 14
Small amounts of chlorine gas can be generated in the laboratory from the reaction of manganese(IV) oxide with hydrochloric acid: \(4 \mathrm{HCl}(\mathrm{aq})+\mathrm{MnO}_{2}(\mathrm{~s})\) \(\rightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{MnCl}_{2}(\mathrm{~s})+\mathrm{Cl}_{2}(\mathrm{~g})\). (a) What mass of \(\mathrm{Cl}_{2}\) can be produced from \(42.7 \mathrm{~g}\) of \(\mathrm{MnO}_{2}\) with an excess of HCl(aq)? (b) What volume of chlorine gas (of density \(3.17 \mathrm{~g} \cdot \mathrm{L}^{-1}\) ) will be produced from the reaction of \(300 \mathrm{~mL}\) of \(0.100 \mathrm{M} \mathrm{HCl}(\mathrm{aq})\) with an excess of \(\mathrm{MnO}_{2}\) ? (c) Suppose only \(150 \mathrm{~mL}\) of chlorine was produced in the reaction in (b). What is the percentage yield of the reaction?
8 step solution