By Martin Silberberg
Through Patricia Amateis of Virginia Tech. This complement comprises distinctive suggestions and reasons for all even-numbered difficulties typically textual content. .
Read or Download Student Solutions Manual to accompany Principles of General Chemistry PDF
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Extra resources for Student Solutions Manual to accompany Principles of General Chemistry
Example text
340 mol AICI) Ammonium chloride is the limiting reactant, and it is important for all subsequent calculations. 49 g NH4CI 3 mol NH4CI I mol AI(N02 )3 = 5 6 . 1 4474 = 56. 1 g AI(N02») AI(N02) 3 remaining: 62 . 5 g - 56. 4 g A I(N 02 h )( ( )( ) NH4CI: none left since it is the limiting reagent. 02 J J 1 33 . 4 g A ICI3 = 2 8 . 6 g N 2 Plan: Multiply the yield of the first step by that of the second step to get the overall yield. Solution : It is simpler to use the decimal equivalents of the percent yields, and then convert to percent using 1 00%.
Either the lead or the chloride ion is limiting - the one producing the fewer moles of product is limiting. Convert the lower number of moles of product to grams of product. Solution: Balanced reaction: Pb(C 2 H 3 0 2 Maq) + N aCI(aq) � PbCI 2 (s) + NaC 2 H 3 0 2 (aq) Because of the l : l ratio, there will be mol of PbCI 2 produced from mol of Pb 2+. The moles of PbCI 2 produced from the NaCI are: 1 O -3 mol NaCI --I mol PbCI 2 = mol PbCI 2 mol NaCI Im L The NaCI is limiting. The mass of PbCI 2 may now be determined using the molar mass.
00) = 1 8 7 . 4 1 mol C U 2 C03 ) ( 1 8 7 . 1 1 g Cu 2 CO 3 I mol C U 2 C03 ) = 1 5 7 3 . 57 x 3 1 0 g CU 2 C03 b ) D i n i trogen pentaox ide has the formula N20S ' Di- indicates 2 N atoms and penta- i ndicates 5 ° atoms. M of N20s = ( 2 x 1 4 . 00) = 1 08 . 02 gimol M ass N20S = ( 2 . 04 X 10 21 N 2 0S mOlecu les = 0 . 366 g N 2 0S ) [ 34 1 �3O l N 2 0S 6 . 02 2 x 1 0 N 2 0S molecules J( 1 08 . 02 g N 2 0S 1 mol N 2 0S ) c) The correct formula for this ionic compound is NaCI04. There are Avogadro ' s number of entities (in this case, formula units) in a mole of this compound .