Question 1

A substance contains 3.024 g hydrogen, 30.97 g phosphorus, and 64.00 g oxygen. How many grams of oxygen are in an 85.00-g sample of the substance?

Accepted Answer

A)   64.00 g
B)   130.1 g
C)   16.00 g
D)   55.51 g
E)   none of these

Question 2

What is the subscript of aluminum in the formula of aluminum phosphate?

Accepted Answer

A)   3
B)   1
C)   2
D)   0
E)   4

Question 3

The molar mass of the insecticide dibromoethane is 187.9 g/mol. Its molecular formula is C2H4Br2. How many atoms of carbon are in a sample of dibromoethane weighing 1.879 g?

Accepted Answer

A)   none of these
B)   1.204  1022
C)   6.022  100.21
D)   6.022  1021
E)   12.04  1044

Question 4

Sulfuric acid may be produced by the following process:   How many moles of H2SO4 will be produced form 5.00 mol of FeS2? A)  12.2 mol B)  20.0 mol C)  6.11 mol D)  10.0 mol E)  5.00 mol " class="answers-bank-image d-inline" rel="preload" >   How many moles of H2SO4 will be produced form 5.00 mol of FeS2?

Accepted Answer

A)   12.2 mol
B)   20.0 mol
C)   6.11 mol
D)   10.0 mol
E)   5.00 mol

Question 5

How many atoms of hydrogen are present in 4.0 g of ammonia?

Accepted Answer

A)   7.8  1024
B)   0.70
C)   4.2  1023
D)   1.2  10-24
E)   1.8 1024

Question 6

In the reaction 2A + B  3C + D
3) 0 mol A and 2.0 mol B react to form 4.0 mol C. What is the percent yield of this reaction?

Accepted Answer

A)   50%
B)   89%
C)   100%
D)   75%
E)   67%

Question 7

Indium has atomic number 49 and atomic mass 114.8 g. Naturally occurring indium contains a mixture of indium-112 and indium-115 in an atomic ratio of approximately

Accepted Answer

A)   75/25.
B)   25/75.
C)   6/94.
D)   50/50.
E)   94/6.

Question 8

Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes. An atom of bromine-79 contains

Accepted Answer

A)   79 protons, 79 electrons, and 35 neutrons.
B)   35 protons, 44 neutrons, and 35 electrons.
C)   44 protons, 44 electrons, and 35 neutrons.
D)   34 protons and 35 electrons only.
E)   35 protons, 79 neutrons, and 35 electrons.

Question 9

Give (in order)  the correct coefficients to balance the following reaction: H2SnCl6 + H2S  SnS2 + HCl

Accepted Answer

A)   1, 2, 2, 2
B)   1, 2, 1, 6
C)   1, 1, 1, 6
D)   6, 2, 1, 1
E)   2, 4, 2, 6

Question 10

A 15-g sample of lithium is reacted with 15 g of fluorine to form lithium fluoride: 2Li + F2  2LiF.
After the reaction is complete, what will be present?

Accepted Answer

A)   2.16 mol lithium fluoride and 0.395 mol fluorine
B)   0.789 mol lithium fluoride and 1.37 mol lithium
C)   0.789 mol lithium fluoride only
D)   2.16 mol lithium fluoride only
E)   none of these

Question 11

21.4 g of Al and 14.6 g of Br2 react according to the following equation: 2Al + 3Br2  2AlBr3
What mass of AlBr3 is formed, assuming 100% yield?

Accepted Answer

A)   36.5 g
B)   212 g
C)  16.2 g
D)   36.0 g
E)   24.4 g

Question 12

Consider the following reaction: CH4(g)  + 4Cl2(g)   CCl4(g)  + 4HCl(g) 
What mass of CCl4 will be formed if 1.6 moles of methane react with 1.6 moles of chlorine?

Accepted Answer

A)   984 g
B)   246 g
C)   58.3 g
D)   61.5 g
E)   24.6 g

Question 13

The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is the other stable isotope?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 14

In the balanced equation for the reaction [A]P4O6(s)  + [B]H2O(l)   [C]H3PO3(aq) 
If [A] equals 2, the coefficient [C] equals

Accepted Answer

A)   6
B)   4
C)   2
D)   10
E)   none of these

Question 15

For which of the following compounds does 1.0 g represent 2.27  10-2 mol?

Accepted Answer

A)   H2O
B)   C2H6
C)   NH3
D)   CO2
E)   CO

Question 16

Consider the new element moonium, atomic number 114, atomic mass 273.2 g. The nucleus of an atom of moonium-273 contains

Accepted Answer

A)   114 protons, 114 alpha particles.
B)   114 protons, 159 neutrons.
C)   114 protons, 273 neutrons.
D)   114 protons, 159 neutrons, 114 electrons.
E)   114 protons, 114 neutrons.

Question 17

The molar mass of the insecticide dibromoethane is 187.9. Its molecular formula is C2H4Br2. What percent by mass of bromine does dibromoethane contain?

Accepted Answer

A)   50.0%
B)   37.8%
C)   42.5%
D)   89.3%
E)   85.0%

Question 18

Acetylsalicylic acid, or aspirin (CS1U1B19S1U1B0HS1U1B18S1U1B0OS1U1B14S1U1B0), is an analgesic (pain reliever). A typical aspirin tablet contains 500.0 mg of acetylsalicylic acid.
-Determine the number of moles of acetylsalicylic acid per tablet.

Accepted Answer

2.775 *10<...

Question 19

How many grams of Ca(NO3) 2 can be produced by reacting excess HNO3 with 7.40 g of Ca(OH) 2?

Accepted Answer

A)   10.2 g
B)   16.4 g
C)   7.40 g
D)   8.22 g
E)   32.8 g

Question 20

A given sample of xenon fluoride contains molecules of a single type, XeFn, where n is some whole number. Given that 9.03  1020 molecules of XeFn weigh 0.311 g, calculate n.

Accepted Answer

A)   2
B)   4
C)   1
D)   none of these

Exam 3: Stoichiometry

Sulfuric acid may be produced by the following process: How many moles of H2SO4 will be produced form 5.00 mol of FeS2?

Correct AnswerverifiedShow Answer

The molar mass of the insecticide dibromoethane is 187.9. Its molecular formula is C2H4Br2. What percent by mass of bromine does dibromoethane contain?

Correct AnswerverifiedShow Answer

In the reaction 2A + B  3C + D 3) 0 mol A and 2.0 mol B react to form 4.0 mol C. What is the percent yield of this reaction?

Correct AnswerverifiedShow Answer

Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes. An atom of bromine-79 contains

Correct AnswerverifiedShow Answer

How many atoms of hydrogen are present in 4.0 g of ammonia?

Correct AnswerverifiedShow Answer

21.4 g of Al and 14.6 g of Br2 react according to the following equation: 2Al + 3Br2  2AlBr3 What mass of AlBr3 is formed, assuming 100% yield?

Correct AnswerverifiedShow Answer

Acetylsalicylic acid, or aspirin (C9H8O4), is an analgesic (pain reliever). A typical aspirin tablet contains 500.0 mg of acetylsalicylic acid. -Determine the number of moles of acetylsalicylic acid per tablet.

Correct Answerverified2.775 *10<...View AnswerShow Answer

The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is the other stable isotope?

Correct AnswerverifiedShow Answer

Give (in order) the correct coefficients to balance the following reaction: H2SnCl6 + H2S  SnS2 + HCl

Correct AnswerverifiedShow Answer

Consider the following reaction: CH4(g) + 4Cl2(g)  CCl4(g) + 4HCl(g) What mass of CCl4 will be formed if 1.6 moles of methane react with 1.6 moles of chlorine?

Correct AnswerverifiedShow Answer

What is the subscript of aluminum in the formula of aluminum phosphate?

Correct AnswerverifiedShow Answer

Indium has atomic number 49 and atomic mass 114.8 g. Naturally occurring indium contains a mixture of indium-112 and indium-115 in an atomic ratio of approximately

Correct AnswerverifiedShow Answer

A substance contains 3.024 g hydrogen, 30.97 g phosphorus, and 64.00 g oxygen. How many grams of oxygen are in an 85.00-g sample of the substance?

Correct AnswerverifiedShow Answer

In the balanced equation for the reaction [A]P4O6(s) + [B]H2O(l)  [C]H3PO3(aq) If [A] equals 2, the coefficient [C] equals

Correct AnswerverifiedShow Answer

The molar mass of the insecticide dibromoethane is 187.9 g/mol. Its molecular formula is C2H4Br2. How many atoms of carbon are in a sample of dibromoethane weighing 1.879 g?

Correct AnswerverifiedShow Answer

How many grams of Ca(NO3) 2 can be produced by reacting excess HNO3 with 7.40 g of Ca(OH) 2?

Correct AnswerverifiedShow Answer

A 15-g sample of lithium is reacted with 15 g of fluorine to form lithium fluoride: 2Li + F2  2LiF. After the reaction is complete, what will be present?

Correct AnswerverifiedShow Answer

Consider the new element moonium, atomic number 114, atomic mass 273.2 g. The nucleus of an atom of moonium-273 contains

Correct AnswerverifiedShow Answer

For which of the following compounds does 1.0 g represent 2.27  10-2 mol?

Correct AnswerverifiedShow Answer

A given sample of xenon fluoride contains molecules of a single type, XeFn, where n is some whole number. Given that 9.03  1020 molecules of XeFn weigh 0.311 g, calculate n.

Correct AnswerverifiedShow Answer

Sulfuric acid may be produced by the following process: How many moles of H₂SO₄ will be produced form 5.00 mol of FeS₂?

Correct Answer
verified

The molar mass of the insecticide dibromoethane is 187.9. Its molecular formula is C₂H₄Br₂. What percent by mass of bromine does dibromoethane contain?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

21.4 g of Al and 14.6 g of Br₂ react according to the following equation: 2Al + 3Br₂  2AlBr₃ What mass of AlBr₃ is formed, assuming 100% yield?

Correct Answer
verified

Acetylsalicylic acid, or aspirin (C₉H₈O₄), is an analgesic (pain reliever). A typical aspirin tablet contains 500.0 mg of acetylsalicylic acid. -Determine the number of moles of acetylsalicylic acid per tablet.

Correct Answer
verified
2.775 *10<...
View Answer

Correct Answer
verified

Give (in order) the correct coefficients to balance the following reaction: H₂SnCl₆ + H₂S  SnS₂ + HCl

Correct Answer
verified

Consider the following reaction: CH₄(g) + 4Cl₂(g)  CCl₄(g) + 4HCl(g) What mass of CCl₄ will be formed if 1.6 moles of methane react with 1.6 moles of chlorine?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In the balanced equation for the reaction [A]P₄O₆(s) + [B]H₂O(l)  [C]H₃PO₃(aq) If [A] equals 2, the coefficient [C] equals

Correct Answer
verified

The molar mass of the insecticide dibromoethane is 187.9 g/mol. Its molecular formula is C₂H₄Br₂. How many atoms of carbon are in a sample of dibromoethane weighing 1.879 g?

Correct Answer
verified

How many grams of Ca(NO₃) ₂ can be produced by reacting excess HNO₃ with 7.40 g of Ca(OH) ₂?

Correct Answer
verified

A 15-g sample of lithium is reacted with 15 g of fluorine to form lithium fluoride: 2Li + F₂  2LiF. After the reaction is complete, what will be present?

Correct Answer
verified

Correct Answer
verified

For which of the following compounds does 1.0 g represent 2.27  10^-² mol?

Correct Answer
verified

A given sample of xenon fluoride contains molecules of a single type, XeF_n, where n is some whole number. Given that 9.03  10²⁰ molecules of XeF_n weigh 0.311 g, calculate n.

Correct Answer
verified