30) Identify the compound with the lowest boiling point. 30) B) CH3OCH3 C) CH3CH

Question

30) Identify the compound with the lowest boiling point. 30) B) CH3OCH3 C) CH3CHO D) CH3CH2CH3 E) (CH3)20 31) What answer should be reported, with the correct number of significant figures, for the fol 31) calculation? (965.43 3.911) 9413.4136 A) 131892 B) 1.32 104 C) 1.319% 104 D) 1.3 x 104 E) 13189 32) Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g 32) N204 and 45.0 g N2H4. Some possibly useful molar masses are as follows: N204-92.02 g/mol, N2H4 = 32.05 g/mol. N204+2 N2H4() 3 N2(g) + 4 H2O(g) A) LR N2H4, 13.3 g N2 formed B) LR N204, 105 g N2 formed C LR N204, 45.7 g N2 formed D) LR = N2H4, 59.0 g N2 formed E) No LR, 45.0 g N2 formed 33) 33) According to the following reaction, what mass of PbCl2 can form from 235 mL of 0.110 M KCI solution? Assume that there is excess Pb(NO3)2 2 Ka(aq) + Pb(NO326a9) PbCl2(s) + 2 KNO3(aq) C5.94 8 D) 3.59 g E) 1.30 g A) 1.80 g B) 7.19 g 34) 34) Which of the following statements is TRUE? A) Dispersion forces are generally stronger than dipole-dipole forces. B) Intermolecular forces hold the atoms in molecules together. C Hydrogen bonds are stronger than covalent bonds. D) Vapor pressure increases with temperature. E) None of the above is true.

Explanation / Answer

30) answer: D alkanes having weak molecular interactions.

31) answer: 1.319*10^4

32) no of mol of N2O4 = 50/92.02 = 0.543 mol

    NOod mol of N2H42 = 45/32.05 = 1.4 mol

1 mol N2O4= 2 mol N2H4

LIMITING REACTANT = N2O4

mass of N2 formed = 0.543*3*28 = 45.7 g

answer: C

33) no of mol of KCl reacted = 235*0.11/1000 = 0.026 mol

   no of mol of Pb(no3)2 = 0.026*1/2 = 0.013 mol

mass of    Pb(no3)2 formed = 0.013*278 = 3.614 g

answer: D

34) answer:b,d

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