t. A s.95-g sample of AgNO, is reacted with excess BaCl according to the cquatio
ID: 952807 • Letter: T
Question
t. A s.95-g sample of AgNO, is reacted with excess BaCl according to the cquation 2AgNO3(aq) + BaCl2(aq)-2A to give 4.48 g of AgCI. What is the percent yield of AgCI? a, 59.5 % b, 44.6% c.892 % d' 753 % e.IO0% gCI(s) + Ba(NO3)day) 32. Of the following, the only empirical formula is 33. The phi of an aqueous NaOH solution is 12.83. What is the hydrogen ion concentration of this solution? a 1.5 x 10-13 M b. 6.7 x 102 M c. 1.2 M d. 6.7 x 1012 M e. 2.7 x 106 M 34. Complete combustion of a 0.70-mol sample of a hydrocarbon, CHy, gives 3.50 mol of CO2 and 2.80 mol of H20 The molecular formula of the original hydrocarbon is 35. The pH of a vinegar solution is 4.15. What is the Hjo" concentration of the solution? a. 7.1 x 10-5 M b, 1.6 × 10-2 M c. 0.62 M d. 1.4 M e, 1.4×104 M 36. If the complete combustion of an unknown mass of ethylene produces 16.0 g CO2, what mass of ethylene is combusted? C2H4(g) +3 026g) 2 CO2(g) + 2 H20g) a. 0.182g b. 0.364g c. 5.10g d. 8.00g e. 12.6gExplanation / Answer
2 AgNO3 (aq) + BaCl2 (aq) -----> 2 AgCl (s) + Ba(NO3)2 (aq)
2 moles of AgNO3 produces 2 moles of AgCl
2 * 170 g of AgNO3 produces 2 * 143.32 g of AgCl
5.95 g of AgNO3 produces ((2 * 143.32)/(2 * 170))*5.95 g of AgCl
= 5.0162 g of AgCl
percentage yield = (4.48 / 5.0162) * 100
= 89.3 %
Answer : C
C6H12 has empirical formula CH2
C4H8 has empirical formula CH2
C3H8 has empirical formula C3H8
H2O2 has empirical formula HO
O2 has empirical formula O
so Answer : C
pH = 12.83
-log[H+] = 12.83
[H+] = 10^-12.83
concentration of H+ ion = 1.48 * 10^-13 = 1.5 * 10^-13
Answer : a
1 mole of CO2 requires 1 mole of C
3.5 moles CO2 require 3.5 moles of C
number of C atoms = 3.5 / 0.7 = 5 C atoms
1 mole of H2O require 2 moles of H
2.8 moles of H2O require 2 * 2.8 mole of H
number of H atoms = 2*2.8 / 0.7 = 8 H atoms
molecular formula of compound = C5H8
Answer : B
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