Molar Mass and Mass Calculations in Chemistry
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Questions and Answers

What is the molar mass of Al2O3?

  • 80 g/mol
  • 134 g/mol
  • 124 g/mol
  • 101 g/mol (correct)

    • How many grams are in 0.75 mol of Cu?

  • 56 g
  • 48 g (correct)
  • 75 g
  • 45 g

    • What is the mass of 2.08 mol of (NH4)2SO4?

  • 250 g
  • 275 g (correct)
  • 290 g
  • 300 g

    • What is the molar mass of SO3?

    <p>80 g/mol</p> Signup and view all the answers

    Calculate the mass of 2.28 mol of Pd.

    <p>243 g</p> Signup and view all the answers

    What is the molar mass of C7H5NO3S?

    <p>183 g/mol</p> Signup and view all the answers

    What is the mass of 3.52 mol of MgBr2?

    <p>648 g</p> Signup and view all the answers

    How much would 0.145 mol of C2H6O weigh?

    <p>7 g</p> Signup and view all the answers

    What is the molar mass of Mg(HCO3)2?

    <p>146.34 g/mol</p> Signup and view all the answers

    How many moles of O2 are in 25.0 g?

    <p>0.78 mol</p> Signup and view all the answers

    What is the total number of grams of H in 34.0 g of propane (C3H8)?

    <p>6.17 g</p> Signup and view all the answers

    Determine the number of moles in 25.0 g of Ga2S3.

    <p>0.10 mol</p> Signup and view all the answers

    What is the molar mass of ZnSO4?

    <p>161.48 g/mol</p> Signup and view all the answers

    How many grams of C are in 1.50 mol of propane?

    <p>54.0 g</p> Signup and view all the answers

    Calculate the number of moles in 25.0 g of butane (C4H10).

    <p>0.43 mol</p> Signup and view all the answers

    What is the total weight of H in 0.254 g of propane?

    <p>0.0465 g</p> Signup and view all the answers

    What is the molar mass of monosodium glutamate (C5H8NNaO4)?

    <p>169.11 g/mol</p> Signup and view all the answers

    In the reaction 3NO2(g) + H2O(l) → NO(g) + 2HNO3(aq), how many oxygen atoms are present in the reactants?

    <p>7</p> Signup and view all the answers

    What is the classification of the reaction 2KClO3(s) → 2KCl(s) + O2(g)?

    <p>Not balanced</p> Signup and view all the answers

    In the equation 2N2(g) + 3O2(g) → 2N2O3(g), how many nitrogen atoms are present in the products?

    <p>6</p> Signup and view all the answers

    How many oxygen atoms are involved in the complete combustion of 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)?

    <p>10</p> Signup and view all the answers

    How many moles of HCl are required for the reaction Al2O3(s) + 6HCl(aq) → 3H2O(l) + 2AlCl3(aq)?

    <p>6</p> Signup and view all the answers

    What is the product formed when PCl3(s) reacts with Cl2(g) to produce PCl5(s)?

    <p>PCl<sub>5</sub></p> Signup and view all the answers

    In the reaction 5C(s) + 2SO2(g) → CS2(g) + 4CO(g), how many oxygen atoms are present in the products?

    <p>4</p> Signup and view all the answers

    What is the balanced equation for the reaction between nitrogen and oxygen to form nitric oxide?

    <p>N2(g) + O2(g) → 2NO(g)</p> Signup and view all the answers

    In the balanced equation 2HgO(s) → 2Hg(l) + O2(g), what is the stoichiometric coefficient for HgO?

    <p>2</p> Signup and view all the answers

    Which of the following is the correct balanced equation for the combustion of butene (C4H8)?

    <p>C4H8(g) + 6O2(g) → 4CO2(g) + 4H2O(g)</p> Signup and view all the answers

    What is the correct balanced equation for the reaction of sulfuric acid with aluminum?

    <p>H2SO4(aq) + 2Al(s) → 3H2(g) + Al2(SO4)3(aq)</p> Signup and view all the answers

    What is the balanced equation for the decomposition of calcium carbonate?

    <p>CaCO3(s) → CaO(s) + CO2(g)</p> Signup and view all the answers

    Which of the following represents the balanced equation for the reaction of potassium sulfate with barium chloride?

    <p>K2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2KCl(aq)</p> Signup and view all the answers

    What is the correct balanced equation for the neutralization reaction between nitric acid and calcium hydroxide?

    <p>2HNO3(aq) + Ca(OH)2(aq) → 2H2O(l) + Ca(NO3)2(aq)</p> Signup and view all the answers

    What is the balanced equation for the synthesis of sodium chloride from sodium and chlorine gas?

    <p>2Na(s) + Cl2(g) → 2NaCl(s)</p> Signup and view all the answers

    What type of reaction is represented by the equation CuCO3(s) → CuO(s) + CO2(g)?

    <p>Decomposition</p> Signup and view all the answers

    Which of the following balanced equations represents a combustion reaction?

    <p>C<sub>4</sub>H<sub>8</sub>(g) + 6O<sub>2</sub>(g) → 4CO<sub>2</sub>(g) + 4H<sub>2</sub>O(g)</p> Signup and view all the answers

    Which balanced equation represents a double replacement reaction?

    <p>Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>(aq) + 6KOH(aq) → 2Al(OH)<sub>3</sub>(s) + 3K<sub>2</sub>SO<sub>4</sub>(aq)</p> Signup and view all the answers

    Which of the following reactions is classified as a single replacement reaction?

    <p>3H<sub>2</sub>SO<sub>4</sub>(aq) + 2Fe(s) → 3H<sub>2</sub>(g) + Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>(aq)</p> Signup and view all the answers

    Which reaction demonstrates a combination reaction?

    <p>2Al(s) + 3Br<sub>2</sub>(l) → 2AlBr<sub>3</sub>(s)</p> Signup and view all the answers

    Which of the following equations illustrates a decomposition reaction?

    <p>2Ni<sub>3</sub>(s) → 3N<sub>2</sub>(g) + 9I<sub>2</sub>(g)</p> Signup and view all the answers

    Which balanced equation indicates a reaction that has been classified as combustion?

    <p>C<sub>6</sub>H<sub>12</sub>(l) + 9O<sub>2</sub>(g) → 6CO<sub>2</sub>(g) + 6H<sub>2</sub>O(g)</p> Signup and view all the answers

    Study Notes

    Molar Mass of Compounds

    • Aluminum oxide (Al2O3) has a molar mass of 102 g/mol.
    • Saccharin (C7H5NO3S) has a molar mass of 183 g/mol.

    Calculating Mass from Moles

    • 5.12 moles of aluminum (Al) has a mass of 138 g.
    • 0.75 moles of copper (Cu) has a mass of 48 g.
    • 3.52 moles of magnesium bromide (MgBr2) has a mass of 648.1 g.
    • 0.145 moles of ethanol (C2H6O) has a mass of 7 g.
    • 2.08 moles of ammonium sulfate ((NH4)2SO4) has a mass of 275 g.

    Calculating Mass from Moles (2)

    • 2.28 moles of palladium (Pd) has a mass of 243 g.
    • 2.28 moles of sulfur trioxide (SO3) has a mass of 183 g.
    • 2.28 moles of lactic acid (C3H6O3) has a mass of 205.4 g.
    • 2.28 moles of magnesium bicarbonate (Mg(HCO3)2) has a mass of 334 g.
    • 2.28 moles of sulfur hexafluoride (SF6) has a mass of 333 g.

    Calculating Moles from Mass

    • 25.0 g of helium (He) contains 6.24 moles.
    • 25.0 g of oxygen gas (O2) contains 0.78 moles.
    • 25.0 g of aluminum hydroxide (Al(OH)3) contains 0.32 moles.
    • 25.0 g of gallium sulfide (Ga2S3) contains 0.10 moles.
    • 25.0 g of butane (C4H10) contains 0.43 moles.

    Propane Gas

    • 34.0 g of propane (C3H8) contains 6.17 moles of hydrogen (H).
    • 1.50 moles of propane (C3H8) contains 54.0 g of carbon (C).
    • 34.0 g of propane (C3H8) contains 27.8 g of carbon (C).
    • 0.254 g of propane (C3H8) contains 0.0465 g of hydrogen (H).

    Molar Mass of Compounds (2)

    • Zinc sulfate (ZnSO4) has a molar mass of 161.5 g/mol.
    • Calcium iodate (Ca(IO3)2) has a molar mass of 215 g/mol.
    • Monosodium glutamate (C5H8NNaO4) has a molar mass of 169.11 g/mol.
    • Isoamyl formate (C6H12O2) has a molar mass of 116.2 g/mol.

    Balancing Chemical Equations

    • Nitrogen gas (N2) reacts with oxygen gas (O2) to produce nitrogen monoxide (NO). The balanced equation is: N2(g) + O2(g) → 2NO(g)
    • Mercury (II) oxide (HgO) decomposes into mercury (Hg) and oxygen (O2). The balanced equation is: 2HgO(s) → 2Hg(l) + O2(g)
    • Iron (Fe) reacts with oxygen (O2) to produce iron (III) oxide (Fe2O3). The balanced equation is: 4Fe(s) + 3O2(g) → 2Fe2O3(s)
    • Sodium (Na) reacts with chlorine gas (Cl2) to produce sodium chloride (NaCl). The balanced equation is: 2Na(s) + Cl2(g) → 2NaCl(s)
    • Copper (I) oxide (Cu2O) reacts with oxygen (O2) to produce copper (II) oxide (CuO). The balanced equation is: 2Cu2 O(s) + O2(g) → 4CuO(s)

    Balancing Chemical Equations (2)

    • Calcium (Ca) reacts with bromine (Br2) to produce calcium bromide (CaBr2). The balanced equation is: Ca(s) + Br2(l) → CaBr2(s)
    • White phosphorus (P4) reacts with oxygen (O2) to produce tetraphosphorus decoxide (P4O10). The balanced equation is: P4(s) + 5O2(g) → P4O10(s)
    • 1-butene (C4H8) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced equation is: C4H8(g) + 6O2(g) → 4CO2(g) + 4H2O(g)
    • Nitric acid (HNO3) reacts with calcium hydroxide (Ca(OH)2) to produce water (H2O) and calcium nitrate (Ca(NO3)2). The balanced equation is: 2HNO3(aq) + Ca(OH)2(aq) → 2H2O(l) + Ca(NO3)2(aq)

    Balancing Chemical Equations (3)

    • Nitric acid (HNO3) reacts with zinc (Zn) to produce hydrogen gas (H2) and zinc nitrate (Zn(NO3)2). The balanced equation is: 2HNO3(aq) + Zn(s) → H2(g) + Zn(NO3)2(aq)
    • Sulfuric acid (H2SO4) reacts with aluminum (Al) to produce hydrogen gas (H2) and aluminum sulfate (Al2(SO4)3). The balanced equation is: 3H2SO4(aq) + 2Al(s) → 3H2(g) + Al2(SO4)3(aq)
    • Potassium sulfate (K2SO4) reacts with barium chloride (BaCl2) to produce barium sulfate (BaSO4) and potassium chloride (KCl). The balanced equation is: K2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2KCl(aq)
    • Calcium carbonate (CaCO3) decomposes into calcium oxide (CaO) and carbon dioxide (CO2). The balanced equation is: CaCO3(s) → CaO(s) + CO2(g)
    • Copper (II) carbonate (CuCO3) decomposes into copper (II) oxide (CuO) and carbon dioxide (CO2). The balanced equation is: CuCO3(s) → CuO(s) + CO2(g)

    Classifying Chemical Reactions

    • Copper (II) oxide (CuO) reacts with hydrochloric acid (HCl) to produce copper (II) chloride (CuCl2) and water (H2O). This is a double replacement reaction.
    • Aluminum (Al) reacts with bromine (Br2) to produce aluminum bromide (AlBr3). This is a combination reaction.
    • 1-hexene (C6H12) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). This is a combustion reaction.
    • Iron (III) oxide (Fe2O3) reacts with carbon (C) to produce iron (Fe) and carbon monoxide (CO). This is a single replacement reaction.
    • Glucose (C6H12O6) decomposes into acetaldehyde (C2H4O) and carbon dioxide (CO2). This is a decomposition reaction.

    Balancing and Identifying Chemical Reactions

    • Ammonia (NH3) reacts with hydrogen chloride (HCl) to produce ammonium chloride (NH4Cl). This is a combination reaction. The balanced equation is: NH3(g) + HCl(g) → NH4Cl(s)
    • 1-butene (C4H8) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). This is a combustion reaction. The balanced equation is: C4H8(g) + 6O2(g) → 4CO2(g) + 4H2O(g)
    • Antimony (Sb) reacts with chlorine gas (Cl2) to produce antimony trichloride (SbCl3). This is a combination reaction. The balanced equation is: 2Sb(s) + 3Cl2(g) → 2SbCl3(s)
    • Nitrogen triiodide (Ni3) decomposes into nitrogen gas (N2) and iodine (I2). This is a decomposition reaction. The balanced equation is: 2Ni3(s) → 3N2(g) + 9I2(g)
    • Potassium bromide (KBr) reacts with chlorine (Cl2) to produce potassium chloride (KCl) and bromine (Br2). This is a single replacement reaction. The balanced equation is: 2KBr(aq) + Cl2(aq) → 2KCl(aq) + Br2(l)
    • Sulfuric acid (H2SO4) reacts with iron (Fe) to produce hydrogen gas (H2) and iron (III) sulfate (Fe2(SO4)3). This is a single replacement reaction. The balanced equation is: 3H2SO4(aq) + 2Fe(s) → 3H2(g) + Fe2(SO4)3(aq)
    • Aluminum sulfate (Al2(SO4)3) reacts with sodium hydroxide (NaOH) to produces aluminum hydroxide (Al(OH)3) and sodium sulfate (Na2SO4). This is a double replacement reaction. The balanced equation is: Al2(SO4)3(aq) + 6NaOH(aq) → 2Al(OH)3(s) + 3Na2SO4(aq)

    Predicting Products in Chemical Reactions

    • Lithium (Li) reacts with oxygen (O2) to produce lithium oxide (Li2O). The balanced equation is: 4Li(s) + O2(g) → 2Li2O(s)
    • Sodium (Na) reacts with water (H2O) to produce sodium hydroxide (NaOH) and hydrogen gas (H2). The balanced equation is: 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
    • Aluminum (Al) reacts with hydrochloric acid (HCl) to produce aluminum chloride (AlCl3) and hydrogen gas (H2). The balanced equation is: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)
    • Mercury (II) oxide (HgO) decomposes into mercury (Hg) and oxygen (O2). The balanced equation is: 2HgO(s) → 2Hg(l) + O2(g)
    • Magnesium (Mg) reacts with nitrogen gas (N2) to produce magnesium nitride (Mg3N2). The balanced equation is: 3Mg(s) + N2(g) → Mg3N2(s)

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    Description

    This quiz covers the calculation of molar mass for various compounds and the conversion of moles to mass. It includes examples with aluminum oxide, saccharin, and multiple other compounds. Test your understanding of these important concepts in chemistry.

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