Question 1

How many mL of concentrated nitric acid (HNO3,16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Accepted Answer

A)  32.0 mL
B)  62.5 mL
C)  125 mL
D)  250.mL
E)  500.mLF) B) and D)
G) None of the above

Question 2

Gaseous methanol (CH4O)reacts with oxygen gas to produce carbon dioxide gas and liquid water.Write a balanced equation for this process.

Accepted Answer

2CH₄O(g)+...

Question 3

Alkanes are compounds of carbon and hydrogen with the general formula CnH2n+2.An alkane component of gasoline has a molar mass of between 125 and 130 g/mol.What is the value of n for this alkane?

Accepted Answer

A)  4
B)  9
C)  10
D)  13
E)  14F) B) and E)
G) A) and D)

Question 4

Gadolinium oxide,a colorless powder which absorbs carbon dioxide from the air,contains 86.76 mass % Gd.Determine its empirical formula.

Accepted Answer

A)  Gd2O3
B)  Gd3O2
C)  Gd3O4
D)  Gd4O3
E)  GdOF) B) and E)
G) None of the above

Question 5

Sodium hydroxide,also known as caustic soda,is used to neutralize acids and to treat cellulose in making of cellophane.Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Accepted Answer

A)  2.543 mol
B)  1.383 mol
C)  0.7232 mol
D)  0.3932 mol
E)  0.001383 molF) A) and D)
G) B) and C)

Question 6

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

Accepted Answer

A)  330 mL
B)  210 mL
C)  86 mL
D)  60 mL
E)  7.3 mLF) A) and B)
G) B) and D)

Question 7

Phosphine,an extremely poisonous and highly reactive gas,will react with oxygen to form tetraphosphorus decaoxide and water.
PH3(g) + O2(g)   →	o→  P4O10(s) + H2O(g) [unbalanced]
Calculate the mass of P4O10(s) formed when 225 g of PH3 reacts with excess oxygen.

Accepted Answer

A)  1880 g
B)  940.g
C)  900.g
D)  470 g
E)  56.3 g F) C) and D)
G) B) and E)

Question 8

Magnesium fluoride is used in the ceramics and glass industry.What is the mass of 1.72 mol of magnesium fluoride?

Accepted Answer

A)  43.3 g
B)  62.3 g
C)  74.5 g
D)  92.9 g
E)  107 gF) C) and E)
G) B) and E)

Question 9

Balance the following equation:
B2O3(s) + HF(l)   →	o→  BF3(g) + H2O(l)

Accepted Answer

A)  B2O3(s) + 6HF(l)   →	o→  2BF3(g) + 3H2O(l) 
B)  B2O3(s) + H6F6(l)   →	o→  B2F6(g) + H6O3(l) 
C)  B2O3(s) + 2HF(l)   →	o→  2BF3(g) + H2O(l) 
D)  B2O3(s) + 3HF(l)   →	o→  2BF3(g) + 3H2O(l) 
E)  B2O3(s) + 6HF(l)   →	o→  2BF3(g) + 6H2O(l)  F) C) and D)
G) A) and B)

Question 10

The number of hydrogen atoms in 0.050 mol of C3H8O3 is

Accepted Answer

A)  3.0  ×	imes×  1022 H atoms
B)  1.2  ×	imes×  1023 H atoms
C)  2.4  ×	imes×  1023 H atoms
D)  4.8  ×	imes×  1023 H atoms
E)  none of these choices is correct F) None of the above
G) A) and B)

Question 11

a.A solution of common salt,NaCl,in water has a concentration of 0.0921 M.Calculate the number of moles of HCl contained in 50.0 mL of this solution.
b.If,instead,an NaCl solution is prepared by dissolving 10.0 g of solid NaCl in enough water to make 250.mL of solution,what is the molarity?

Accepted Answer

a.0.00461 ...

Question 12

Magnesium reacts with iron(III) chloride to form magnesium chloride (which can be used in fireproofing wood and in disinfectants) and iron.
3Mg(s) + 2FeCl3(s)   →	o→  3MgCl2(s) + 2Fe(s) 
A mixture of 41.0 g of magnesium ( 3(s)   	o  3MgCl2(s) + 2Fe(s)  A mixture of 41.0 g of magnesium (   = 24.31 g/mol) and 175 g of iron(III) chloride (   = 162.2 g/mol) is allowed to react.What mass of magnesium chloride = 95.21 g/mol) is formed? A) 68.5 g MgCl2 B) 77.0 g MgCl2 C) 71.4 g MgCl2 D) 107 g MgCl2 E) 154 g MgCl2 " class="answers-bank-image d-inline" rel="preload" >
= 24.31 g/mol) and 175 g of iron(III) chloride ( 3(s)   	o  3MgCl2(s) + 2Fe(s)  A mixture of 41.0 g of magnesium (   = 24.31 g/mol) and 175 g of iron(III) chloride (   = 162.2 g/mol) is allowed to react.What mass of magnesium chloride = 95.21 g/mol) is formed? A) 68.5 g MgCl2 B) 77.0 g MgCl2 C) 71.4 g MgCl2 D) 107 g MgCl2 E) 154 g MgCl2 " class="answers-bank-image d-inline" rel="preload" >
= 162.2 g/mol) is allowed to react.What mass of magnesium chloride = 95.21 g/mol) is formed?

Accepted Answer

A)  68.5 g MgCl2
B)  77.0 g MgCl2
C)  71.4 g MgCl2
D)  107 g MgCl2
E)  154 g MgCl2 F) A) and B)
G) A) and C)

Question 13

Calcium fluoride,CaF2,is a source of fluorine and is used to fluoridate drinking water.Calculate its molar mass.

Accepted Answer

A)  118.15 g/mol
B)  99.15 g/mol
C)  78.07 g/mol
D)  59.08 g/mol
E)  50.01 g/molF) None of the above
G) C) and E)

Question 14

When a solution is diluted with water,the ratio of the initial to final volumes of solution is equal to the ratio of final to initial molarities.

Accepted Answer

A) True 
 B)False

Question 15

What volume,in L,of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

Accepted Answer

A)  0.800 L
B)  0.400 L
C)  0.200 L
D)  0.100 L
E)  None of these choices is correct.F) A) and B)
G) D) and E)

Question 16

Aluminum oxide,Al2O3,is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al2O3.

Accepted Answer

A)  2.377 mol
B)  2.146 mol
C)  1.105 mol
D)  0.4660 mol
E)  0.4207 molF) B) and C)
G) D) and E)

Question 17

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65  ×	imes×  1020 molecules of SO3.

Accepted Answer

A)  6.06  ×	imes×  10-4 g
B)  2.91  ×	imes×  10-2 g
C)  4.85  ×	imes×  10-2 g
D)  20.6 g
E)  1650 g F) A) and B)
G) A) and E)

Question 18

Lead(II) sulfide was once used in glazing earthenware.It will also react with hydrogen peroxide to form lead(II) sulfate and water.How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide?

Accepted Answer

A)  151 g
B)  123 g
C)  50.3 g
D)  37.7 g
E)  9.41 gF) All of the above
G) A) and E)

Question 19

In 0.20 mole of phosphoric acid,H3PO4,
a.how many H atoms are there?
b.what is the total number of atoms?
c.how many moles of O atoms are there?

Accepted Answer

a.3.61

10²³

Question 20

When 2.61 g of solid Na2CO3 is dissolved in sufficient water to make 250 mL of solution,the concentration of Na2CO3 is:

Accepted Answer

A)  0.0246 M
B)  10.4 M
C)  0.205 M
D)  0.0985 M
E)  0.141 MF) A) and B)
G) All of the above

Exam 3: Stoichiometry of Formulas and Equations

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 $\times$ 10²⁰ molecules of SO₃.

Correct Answer
verified

When 2.61 g of solid Na₂CO₃ is dissolved in sufficient water to make 250 mL of solution,the concentration of Na₂CO₃ is:

Correct Answer
verified

What volume,in L,of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

Correct Answer
verified

a.A solution of common salt,NaCl,in water has a concentration of 0.0921 M.Calculate the number of moles of HCl contained in 50.0 mL of this solution. b.If,instead,an NaCl solution is prepared by dissolving 10.0 g of solid NaCl in enough water to make 250.mL of solution,what is the molarity?

Correct Answer
verified
a.0.00461 ...
View Answer

Gaseous methanol (CH₄O)reacts with oxygen gas to produce carbon dioxide gas and liquid water.Write a balanced equation for this process.

Correct Answer
verified
2CH₄O(g)+...
View Answer

Calcium fluoride,CaF₂,is a source of fluorine and is used to fluoridate drinking water.Calculate its molar mass.

Correct Answer
verified

Balance the following equation: B₂O₃(s) + HF(l) $\to$ BF₃(g) + H₂O(l)

Correct Answer
verified

Gadolinium oxide,a colorless powder which absorbs carbon dioxide from the air,contains 86.76 mass % Gd.Determine its empirical formula.

Correct Answer
verified

Phosphine,an extremely poisonous and highly reactive gas,will react with oxygen to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) $\to$ P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃ reacts with excess oxygen.

Correct Answer
verified

In 0.20 mole of phosphoric acid,H₃PO₄, a.how many H atoms are there? b.what is the total number of atoms? c.how many moles of O atoms are there?

Correct Answer
verified
a.3.61 10^{23View Answer}

How many mL of concentrated nitric acid (HNO₃,16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct Answer
verified

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

Correct Answer
verified

Sodium hydroxide,also known as caustic soda,is used to neutralize acids and to treat cellulose in making of cellophane.Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Correct Answer
verified

When a solution is diluted with water,the ratio of the initial to final volumes of solution is equal to the ratio of final to initial molarities.

Correct Answer
verified

Correct Answer
verified

Aluminum oxide,Al₂O₃,is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al₂O₃.

Correct Answer
verified

Magnesium fluoride is used in the ceramics and glass industry.What is the mass of 1.72 mol of magnesium fluoride?

Correct Answer
verified

Alkanes are compounds of carbon and hydrogen with the general formula C_nH₂_n₊₂.An alkane component of gasoline has a molar mass of between 125 and 130 g/mol.What is the value of n for this alkane?

Correct Answer
verified

The number of hydrogen atoms in 0.050 mol of C₃H₈O₃ is

Correct Answer
verified

Lead(II) sulfide was once used in glazing earthenware.It will also react with hydrogen peroxide to form lead(II) sulfate and water.How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide?

Correct Answer
verified

Exam 3: Stoichiometry of Formulas and Equations

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 ×\times× 1020 molecules of SO3.

Correct AnswerverifiedShow Answer

When 2.61 g of solid Na2CO3 is dissolved in sufficient water to make 250 mL of solution,the concentration of Na2CO3 is:

Correct AnswerverifiedShow Answer

What volume,in L,of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

Correct AnswerverifiedShow Answer

a.A solution of common salt,NaCl,in water has a concentration of 0.0921 M.Calculate the number of moles of HCl contained in 50.0 mL of this solution. b.If,instead,an NaCl solution is prepared by dissolving 10.0 g of solid NaCl in enough water to make 250.mL of solution,what is the molarity?

Correct Answerverifieda.0.00461 ...View AnswerShow Answer

Gaseous methanol (CH4O)reacts with oxygen gas to produce carbon dioxide gas and liquid water.Write a balanced equation for this process.

Correct Answerverified2CH4O(g)+...View AnswerShow Answer

Calcium fluoride,CaF2,is a source of fluorine and is used to fluoridate drinking water.Calculate its molar mass.

Correct AnswerverifiedShow Answer

Balance the following equation: B2O3(s) + HF(l) →\to→ BF3(g) + H2O(l)

Correct AnswerverifiedShow Answer

Gadolinium oxide,a colorless powder which absorbs carbon dioxide from the air,contains 86.76 mass % Gd.Determine its empirical formula.

Correct AnswerverifiedShow Answer

Phosphine,an extremely poisonous and highly reactive gas,will react with oxygen to form tetraphosphorus decaoxide and water. PH3(g) + O2(g) →\to→ P4O10(s) + H2O(g) [unbalanced] Calculate the mass of P4O10(s) formed when 225 g of PH3 reacts with excess oxygen.

Correct AnswerverifiedShow Answer

In 0.20 mole of phosphoric acid,H3PO4, a.how many H atoms are there? b.what is the total number of atoms? c.how many moles of O atoms are there?

Correct Answerverifieda.3.61 1023View AnswerShow Answer

How many mL of concentrated nitric acid (HNO3,16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct AnswerverifiedShow Answer

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

Correct AnswerverifiedShow Answer

Sodium hydroxide,also known as caustic soda,is used to neutralize acids and to treat cellulose in making of cellophane.Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Correct AnswerverifiedShow Answer

When a solution is diluted with water,the ratio of the initial to final volumes of solution is equal to the ratio of final to initial molarities.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Aluminum oxide,Al2O3,is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al2O3.

Correct AnswerverifiedShow Answer

Magnesium fluoride is used in the ceramics and glass industry.What is the mass of 1.72 mol of magnesium fluoride?

Correct AnswerverifiedShow Answer

Alkanes are compounds of carbon and hydrogen with the general formula CnH2n+2.An alkane component of gasoline has a molar mass of between 125 and 130 g/mol.What is the value of n for this alkane?

Correct AnswerverifiedShow Answer

The number of hydrogen atoms in 0.050 mol of C3H8O3 is

Correct AnswerverifiedShow Answer

Lead(II) sulfide was once used in glazing earthenware.It will also react with hydrogen peroxide to form lead(II) sulfate and water.How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide?

Correct AnswerverifiedShow Answer

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 $\times$ 10²⁰ molecules of SO₃.

Correct Answer
verified

When 2.61 g of solid Na₂CO₃ is dissolved in sufficient water to make 250 mL of solution,the concentration of Na₂CO₃ is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a.0.00461 ...
View Answer

Gaseous methanol (CH₄O)reacts with oxygen gas to produce carbon dioxide gas and liquid water.Write a balanced equation for this process.

Correct Answer
verified
2CH₄O(g)+...
View Answer

Calcium fluoride,CaF₂,is a source of fluorine and is used to fluoridate drinking water.Calculate its molar mass.

Correct Answer
verified

Balance the following equation: B₂O₃(s) + HF(l) $\to$ BF₃(g) + H₂O(l)

Correct Answer
verified

Correct Answer
verified

Phosphine,an extremely poisonous and highly reactive gas,will react with oxygen to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) $\to$ P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃ reacts with excess oxygen.

Correct Answer
verified

In 0.20 mole of phosphoric acid,H₃PO₄, a.how many H atoms are there? b.what is the total number of atoms? c.how many moles of O atoms are there?

Correct Answer
verified
a.3.61 10^{23View Answer}

How many mL of concentrated nitric acid (HNO₃,16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Aluminum oxide,Al₂O₃,is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al₂O₃.

Correct Answer
verified

Correct Answer
verified

Alkanes are compounds of carbon and hydrogen with the general formula C_nH₂_n₊₂.An alkane component of gasoline has a molar mass of between 125 and 130 g/mol.What is the value of n for this alkane?

Correct Answer
verified

The number of hydrogen atoms in 0.050 mol of C₃H₈O₃ is

Correct Answer
verified

Correct Answer
verified