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 (D)</p> Signup and view all the answers

Calculate the mass of 2.28 mol of Pd.

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

What is the molar mass of C7H5NO3S?

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

What is the mass of 3.52 mol of MgBr2?

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

How much would 0.145 mol of C2H6O weigh?

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

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

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

How many moles of O2 are in 25.0 g?

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

Determine the number of moles in 25.0 g of Ga2S3.

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

What is the molar mass of ZnSO4?

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

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

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

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

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

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

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

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

<p>169.11 g/mol (A)</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 (C)</p> Signup and view all the answers

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

<p>Not balanced (D)</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 (A)</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 (A)</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 (C)</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> (C)</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 (C)</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) (A)</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 (A)</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) (A)</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) (C)</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) (B)</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) (A)</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) (A)</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) (B)</p> Signup and view all the answers

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

<p>Decomposition (C)</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) (D)</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) (A)</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) (B)</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) (C)</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) (A)</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) (A)</p> Signup and view all the answers

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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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