30) Identify the compound with the lowest boiling point. 30) A) CH3CH2CH2OH B) C

Question

30) Identify the compound with the lowest boiling point. 30) A) CH3CH2CH2OH B) CH3OCH3 O CH3CHO D) CH3CH2CH3 E) (CH3)20 31) What answer should be reported, with the correct number of significant figures, for the following 31) calculation? (96543-3911) + 94134136 A) 13189.2 B) 1.32104 1.319 x 104 D) 1.3 104 E) 13189 formed from 50og 32) 32) Determine the limiting reactant (L.R) and the mass (in g) of nitrogen that can be f ollows: N204-9202 g/mol, N204 and 450 g N2H4. Some possibly useful molar masses are as f 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(NO3)2(aq) Pbd2(s) + 2 KNO3(aq) A) 1.80 g B) 7.19g C)5.948 D)3.59 g E) 1.30 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. ) Hydrogen bonds are stronger than covalent bonds. D) Vapor pressure increases E) None of the above is true. with temperature.

Explanation / Answer

30.

(D) CH3CH2CH3 has lowest boiling point because of having only weak london forces among its molecules.

31.

(E)

965.43 * 3.911 = 3776.

**** Answer of multiplication or division should have that many significant figues as the multiplying or dividng number that has least significant figures.

3776. + 9413.136 = 13189.

**** Answer of addition or substraction should have that many decimal places as the adding or substracting number that has least decimal places.

So, (E)

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