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Stoichiometry (Ch8 -Part B) (1797460)
Question
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Description
This assignment is to emphasize Stoichiometry, Concentration, and Balancing
Equations.
Instructions
You will be allowed three submissions
1.
Question Details
defective [421000]
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Calculate each of the following quantities.
(a) total number of ions in 45.2 g CaF2
1.05e+24 ions
(b) mass in milligrams of 4.65 mol CuCl2 2 H2O
7.93e+05 mg
(c) mass in kilograms of 2.12
1022 formula units of Bi(NO3)3 5 H2O
0.0171 kg
Solution or Explanation
3.15
FU = formula unit
a) Ions =
23
= 8.81550 x 10
23
= 8.82 x 10
ions
b) Mass CuCl2•2H2O =
5
= 610318.4 = 6.10 x 10 mg CuCl2•2H2O
c) Mass Bi(NO3)3•5H2O =
= 0.0231997 = 0.0232 kg Bi(NO 3)3•5H2O
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Silber4 3.AlgoEOCP.062. [421007]
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Bismuth oxide reacts with carbon to form bismuth metal.
Bi2O3(s) + 3 C(s)
2 Bi(s) + 3 CO(g)
(a) When 426 g Bi2O3 reacts with excess carbon, how many moles of Bi2O3 react?
0.914 mol
(b) How many moles of Bi form?
1.83 mol
Solution or Explanation
3.62
Bi2O 3(s) + 3 C(s)
2 Bi(s) + 3 CO(g)
a) Moles Bi2O3 =
= 0.7553648 = 0.755 mol Bi2O 3
b) Moles Bi =
= 1.5107 = 1.51 mol Bi
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3.
Question Details
Silber4 3.AlgoEOCP.092. [421175]
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Calculate each of the following quantities.
(a) grams of solute in 164.9 mL of 0.207 M calcium acetate
5.40 g
(b) molarity of 437 mL solution containing 21.1 g of potassium iodide
0.291 M
(c) moles of solute in 145.6 L of 0.807 M sodium cyanide
117 mol
Solution or Explanation
3.92
Plan: In all cases, the definition of molarity (moles/liters) will be important. The molar mass is important in some
cases. The
chemical formulas are necessary.
Solution:
a) Grams Ca(C2H3O2)2 =
= 5.7559 = 5.76 g Ca(C2H3O2)2
b) Molarity KI =
c) Moles NaCN =
= 0.254217 = 0.254 M KI
= 123.76 = 124 mol NaCN
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Silber4 3.StaticEOCP.065b. [420722]
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33.61 g of diborane (B2H6) reacts with excess water according to the following unbalanced equation:
B2H6(g) + H2O(l)
H3BO3(s) + H2(g)
Calculate the mass of H2 formed.
14.69 g H2
7.347 g H2
7 g H2
2.452 g H2
5.
Question Details
When the chemical equation, Na2S2O3(aq) + Cl2(aq) + H2O(l)
Silber4 3.Supp.3-10. [430748]
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NaHSO4(aq) + HCl(aq), is balanced, the stoichiometric
coefficients are, respectively,
1, 4, 5, 2, 8.
1, 2, 4, 1, 2.
2, 3, 5, 2, 4.
2, 4, 3, 2, 8.
Solution or Explanation
There must be equal numbers of each type of atom on each side of the equation for mass balance.
6.
Question Details
Silber4 3.TB.069. [420812]
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What mass of carbon is needed to react with 10.00 g of SnO2(s) according to the following chemical equation: SnO2(s) + 2
C(s)
Sn(s) + 2 CO(g)?
1.59 g
7.94 g
23.8 g
3.97 g
Assignment Details
7/18/2011 5:48 PM