Calculate the molar mass of rubidium carbonate, Rb2CO3.

A) 340.43 g/mol B) 255.00 g/mol C) 230.94 g/mol D) 145.47 g/mol E) 113.48 g/mol A) 340.43 g/mol B) 255.00 g/mol C) 230.94 g/mol D) 145.47 g/mol E) 113.48 g/mol

How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO3 (? = 84.02 g/mol)? HCl(aq) + NaHCO3(s) $\rightarrow$ NaCl(s) + H2O(l) + CO2(g)

A) 638 mL B) 572 mL C) 536 mL D) 276 mL E) 175 mL A) 638 mL B) 572 mL C) 536 mL D) 276 mL E) 175 mL

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?

A) 4 B) 9 C) 10 D) 13 E) 14 A) 4 B) 9 C) 10 D) 13 E) 14

Calculate the molar mass of (NH4)3AsO4.

A) 417.80 g/mol B) 193.03 g/mol C) 165.02 g/mol D) 156.96 g/mol E) 108.96 g/mol A) 417.80 g/mol B) 193.03 g/mol C) 165.02 g/mol D) 156.96 g/mol E) 108.96 g/mol

Calculate the molar mass of tetraphosphorus decaoxide, P4O10, a corrosive substance which can be used as a drying agent.

A) 469.73 g/mol B) 283.89 g/mol C) 190.97 g/mol D) 139.88 g/mol E) 94.97 g/mol A) 469.73 g/mol B) 283.89 g/mol C) 190.97 g/mol D) 139.88 g/mol E) 94.97 g/mol

Exam 3: Stoichiometry of Formulas and Equations

How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides) are needed to form 485 g of sulfur tetrafluoride? 3SCl₂(l) + 4NaF(s) $\rightarrow$ SF₄(g) + S₂Cl₂(l) + 4NaCl(s)

(Multiple Choice)

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Question 81

Calculate the molar mass of rubidium carbonate, Rb₂CO₃.

(Multiple Choice)

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Question 82

How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO₃ (? = 84.02 g/mol)? HCl(aq) + NaHCO₃(s) $\rightarrow$ NaCl(s) + H₂O(l) + CO₂(g)

(Multiple Choice)

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Question 83

Potassium dichromate, K₂Cr₂O₇, is used in tanning leather, decorating porcelain and water proofing fabrics. Calculate the number of chromium atoms in 78.82 g of K₂Cr₂O₇.

(Multiple Choice)

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Question 84

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?

(Multiple Choice)

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Question 85

Calculate the molar mass of (NH₄)₃AsO₄.

(Multiple Choice)

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Question 86

The iodine "clock reaction" involves the following sequence of reactions occurring in a reaction mixture in a single beaker. 1. IO₃¯(aq) + 5I¯(aq) + 6H⁺(aq) $\rightarrow$ 3I₂(aq) + 3H₂O(l) 2. I₂(aq) + 2S₂O₃²¯(aq) $\rightarrow$ 2I¯(aq) + S₄O₆²¯(aq) The molecular iodine (I₂) formed in reaction 1 is immediately used up in reaction 2, so that no iodine accumulates. In one experiment, a student made up a reaction mixture which initially contained 0.0020 mol of iodate ions (IO₃¯). If the iodate ions reacted completely, how many moles of thiosulfate ions (S₂O₃²¯) were needed in reaction 2, in order to react completely with the iodine (I₂) produced in reaction 1?

(Multiple Choice)

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Question 87

In combustion analysis, the carbon and hydrogen contents of a substance are determined from the CO₂ and H₂O, respectively, which are collected in the absorbers.

(True/False)

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Question 88

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?

(Multiple Choice)

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Question 89

A compound consisting of C, H and O only, has a molar mass of 331.5 g/mol. Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO₂ absorber and a 0.0951 g increase in the mass of the H₂O absorber. What is the empirical formula of the compound?

(Short Answer)

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Question 90

Calculate the molar mass of tetraphosphorus decaoxide, P₄O₁₀, a corrosive substance which can be used as a drying agent.

(Multiple Choice)

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Question 91

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

(Multiple Choice)

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Question 92

A single atom of hydrogen has a mass of 1.0 amu, while a mole of hydrogen atoms has a mass of 1.0 g. Select the correct conversion factor between atomic mass units and grams.

(Multiple Choice)

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Question 93

Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis it produced 1.471 g CO₂ and 0.226 g H₂O. If its molar mass is between 158 and 167 g/mol, what is its molecular formula?

(Multiple Choice)

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Question 94

Aluminum reacts with oxygen to produce aluminum oxide which can be used as an adsorbent, desiccant or catalyst for organic reactions. 4Al(s) + 3O₂(g) $\rightarrow$ 2Al₂O₃(s) A mixture of 82.49 g of aluminum (? = 26.98 g/mol) and 117.65 g of oxygen (? = 32.00 g/mol) is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

(Multiple Choice)

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Question 95

In a correctly balanced equation, the number of reactant molecules must equal the number of product molecules.

(True/False)

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Question 96

Showing 81 - 96 of 96

How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides) are needed to form 485 g of sulfur tetrafluoride? 3SCl₂(l) + 4NaF(s) $\rightarrow$ SF₄(g) + S₂Cl₂(l) + 4NaCl(s)

Calculate the molar mass of rubidium carbonate, Rb₂CO₃.

How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO₃ (? = 84.02 g/mol)? HCl(aq) + NaHCO₃(s) $\rightarrow$ NaCl(s) + H₂O(l) + CO₂(g)

Potassium dichromate, K₂Cr₂O₇, is used in tanning leather, decorating porcelain and water proofing fabrics. Calculate the number of chromium atoms in 78.82 g of K₂Cr₂O₇.

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?

Calculate the molar mass of (NH₄)₃AsO₄.

In combustion analysis, the carbon and hydrogen contents of a substance are determined from the CO₂ and H₂O, respectively, which are collected in the absorbers.

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?

A compound consisting of C, H and O only, has a molar mass of 331.5 g/mol. Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO₂ absorber and a 0.0951 g increase in the mass of the H₂O absorber. What is the empirical formula of the compound?

Calculate the molar mass of tetraphosphorus decaoxide, P₄O₁₀, a corrosive substance which can be used as a drying agent.

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

A single atom of hydrogen has a mass of 1.0 amu, while a mole of hydrogen atoms has a mass of 1.0 g. Select the correct conversion factor between atomic mass units and grams.

In a correctly balanced equation, the number of reactant molecules must equal the number of product molecules.

Keys to the Study of Chemistry

The Components of Matter

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 3: Stoichiometry of Formulas and Equations

How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides) are needed to form 485 g of sulfur tetrafluoride? 3SCl2(l) + 4NaF(s) →\rightarrow→ SF4(g) + S2Cl2(l) + 4NaCl(s)

Calculate the molar mass of rubidium carbonate, Rb2CO3.

How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO3 (? = 84.02 g/mol)? HCl(aq) + NaHCO3(s) →\rightarrow→ NaCl(s) + H2O(l) + CO2(g)

Potassium dichromate, K2Cr2O7, is used in tanning leather, decorating porcelain and water proofing fabrics. Calculate the number of chromium atoms in 78.82 g of K2Cr2O7.

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?

Calculate the molar mass of (NH4)3AsO4.

In combustion analysis, the carbon and hydrogen contents of a substance are determined from the CO2 and H2O, respectively, which are collected in the absorbers.

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?

A compound consisting of C, H and O only, has a molar mass of 331.5 g/mol. Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO2 absorber and a 0.0951 g increase in the mass of the H2O absorber. What is the empirical formula of the compound?

Calculate the molar mass of tetraphosphorus decaoxide, P4O10, a corrosive substance which can be used as a drying agent.

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

A single atom of hydrogen has a mass of 1.0 amu, while a mole of hydrogen atoms has a mass of 1.0 g. Select the correct conversion factor between atomic mass units and grams.

In a correctly balanced equation, the number of reactant molecules must equal the number of product molecules.

Keys to the Study of Chemistry

The Components of Matter

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides) are needed to form 485 g of sulfur tetrafluoride? 3SCl₂(l) + 4NaF(s) $\rightarrow$ SF₄(g) + S₂Cl₂(l) + 4NaCl(s)

Calculate the molar mass of rubidium carbonate, Rb₂CO₃.

How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO₃ (? = 84.02 g/mol)? HCl(aq) + NaHCO₃(s) $\rightarrow$ NaCl(s) + H₂O(l) + CO₂(g)

Potassium dichromate, K₂Cr₂O₇, is used in tanning leather, decorating porcelain and water proofing fabrics. Calculate the number of chromium atoms in 78.82 g of K₂Cr₂O₇.

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?

Calculate the molar mass of (NH₄)₃AsO₄.

In combustion analysis, the carbon and hydrogen contents of a substance are determined from the CO₂ and H₂O, respectively, which are collected in the absorbers.

A compound consisting of C, H and O only, has a molar mass of 331.5 g/mol. Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO₂ absorber and a 0.0951 g increase in the mass of the H₂O absorber. What is the empirical formula of the compound?

Calculate the molar mass of tetraphosphorus decaoxide, P₄O₁₀, a corrosive substance which can be used as a drying agent.