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1 | |
How many phosphorus atoms are there in 2.57 g of this element?
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| | A) | 4.99 x 1022 atoms
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| | B) | 4.80 x 1025 atoms
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| | C) | 7.26 x 1024 atoms
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| | D) | 0.0829 atoms
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| | E) | 2.57 atoms
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2 | |
What is the mass of 5.45 x 10-3 mol of glucose C6H12O6?
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| | A) | 0.158 g
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| | B) | 981 g
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| | C) | 3.03 x 10-5 g
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| | D) | 0.981 g
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| | E) | none of the above
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3 | |
A 20.0 mL sample of an element with a density of 3.0 g/mL contains 4 x 1023 atoms.
What is the atomic weight of this element? |
| | A) | 300 |
| | B) | 40 |
| | C) | 60 |
| | D) | 90 |
| | E) | none of the above |
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4 | |
The mass percent nitrogen in nitrous acid, HNO2, is
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| | A) | 7%
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| | B) | 14%
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| | C) | 30.%
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| | D) | 45%
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| | E) | 60.%
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5 | |
A pure sample of a new chemical compound was analyzed and was found to have the following mass percentages:
Al 31.5 %; O 56.1 %; S 12.4 %.
What is the empirical formula of this compound?
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| | A) | Al5O28S7 |
| | B) | Al3O9S
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| | C) | AlO2S2 |
| | D) | Al4O14S7 |
| | E) | AlO6S1.5 |
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6 | |
The molecular formula for a compound with a molar mass of 41.5 g/mol that is 78.2% B and
21.8% H is |
| | A) | B3H9 |
| | B) | B2H2 |
| | C) | BH3 |
| | D) | B4H4 |
| | E) | B2H6 |
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7 | |
What is the sum of the four coefficients when the following equation is balanced?
Equation: CS2 + CaO → CO2 + CaS
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| | A) | 5
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| | B) | 6
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| | C) | 8
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| | D) | 10
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| | E) | 11
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8 | |
Balance the second step of the Ostwald process to determine the three coefficients.
Equation: NO + O2 → NO2 |
| | A) | 1, 1, 1, respectively
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| | B) | 2, 1, 2
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| | C) | 2, 5/2, 2
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| | D) | 4, 5, 4
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| | E) | none of the above
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9 | |
How many moles of oxygen gas will react with 12.4 mol aluminum?
Equation: 4Al + 3O2 → 2Al2O3 |
| | A) | 0.24 mol
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| | B) | 0.42 mol
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| | C) | 4.8 mol
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| | D) | 9.3 mol
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| | E) | 16.8 mol
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10 | |
In the reaction of Fe3O4 with carbon to form carbon dioxide and iron, the number of moles of carbon required to convert 23 g of Fe3O4 to products is
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| | A) | 0.05
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| | B) | 0.1
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| | C) | 0.2
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| | D) | 0.3
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| | E) | 0.4
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11 | |
Hydrogen chloride can be prepared by the reaction shown below:
2NaCl(s) + H2SO4(l) → 2HCl(g) + Na2SO4(s)
How many grams of HCl can be prepared from 393 g H2SO4 and 4.00 moles NaCl?
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| | A) | 293 g
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| | B) | 1.003 g
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| | C) | 786 g
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| | D) | 146 g
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| | E) | 393 g
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12 | |
What is the percent yield of PI3, if 58.62 g of I2 are reacted with an excess of phosphorus and 60.75 g of PI3 are actually obtained?
Equation: 2P(s) + 3I2(s) → 2PI3(s)
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| | A) | 84.97 %
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| | B) | 1.57 %
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| | C) | 48.37 %
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| | D) | 37.6 %
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| | E) | 95.8 %
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13 | |
What is the molar concentration of a solution containing 22.0 g of CH3OH in 250 cm3of solution?
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| | A) | 3.17 M |
| | B) | 0.088 M |
| | C) | 8.80 M |
| | D) | 2.75 M |
| | E) | 4.25 M |
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14 | |
Approximately how many mL of water must be added to 300 mL of 0.75 M HCl to dilute the solution to 0.25 M?
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| | A) | 900 mL
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| | B) | 600 mL
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| | C) | 300 mL
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| | D) | 930 mL
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| | E) | 100 mL
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15 | |
How many grams of NaH2PO4 are needed to react completely with 57.48 mL of 0.225 M NaOH? The molar mass of NaH2PO4 is 119.98 g/mol.
Equation: NaH2PO4(s) + 2NaOH(aq) → Na3PO4(aq) + 2H2O(l)
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| | A) | 38.80 g
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| | B) | 0.776 g
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| | C) | 0.388 g
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| | D) | 7.766 g
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| | E) | 0.194 g
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