4.7.3: Answers to Chemical Quantities (Exercises)
- Page ID
- 290944
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Using Moles & Avogadro's Number
1.
- 2.67 mol of H and 2.67 mol of Cl
- 5.34 mol of H, 2.67 mol of S, and 10.68 mol of O
- 2.67 mol of Al, 8.01 mol of N, and 24.03 mol of O
- 5.34 mol of Ga, 8.01 mol of S, and 32.04 mol of O
2.
a. 0.45 mol of H and 0.45 mol of Cl
b. 0.90 mol of H, 0.45 mol S, and 1.8 mol O
c. 0.90 mol Al, 1.35 mol C, and 4.05 mol O
d. 0.90 mol Ga, 1.35 mol S, 5.4 mol O
3. a. 1.20 x 1024 atoms of Fe; b. 2.63 x 1024 atoms of Si; c. 7.23 x 1021 atoms of Li+; d. 5.27 x 1023 S2- ions
4.
a. 5.72 x 1022 molecules of water (H2O)
b. 1.93 x 1021 formula units of sodium chloride (NaCl)
c. 1.24 x 1024 formula units of calcium bromide (CaBr2)
d. 8.43 x 1022 molecules of glucose ( C6H12O)
5. a. 1.15 moles Cu; b. 0.0118 moles CO2; c. 0.0553 mol Pb4+; d. 1.16 mol LiNO3; e. 0.857 mol N2
6. 4.52 x 1021 molecules of hemoglobin
Molar Mass
1. (a) 123.896 g/mol; (b) 18.015 g/mol; (c) 164.086 g/mol; (d) 60.052 g/mol; (e) 342.297 g/mol
2. (a) 256.528 g/mol; (b) 72.150 g/mol; (c) 378.103 g/mol; (d) 58.080 g/mol; (e) 180.158 g/mol
3. 324.43 g/mol
4. 169.94 g/mol
Mole/Mass Conversions
- (a) 0.819 g; (b) 307 g; (c) 0.23 g; (d) 1.235 × 106 g (1235 kg); (e) 765 g
2. 8.38 x 10-3 moles of leucine
3. (a) 9.60 g; (b) 19.2 g; (c) 28.8 g
4. (a) 0.719 mol MgSO4 ; (b) 8.21 mol CO; (c) 0.964 mol KCN; (d) 6.2 x 10-3 mol Cl2
5. 5.93 x 10-7 moles of linalool
Mass/Particle Conversions
1. (a) 4.31 x 1022 atoms Ni ; (b) 7.01 x 1020 ions Br- ; (c) 2.52 x 1023 molecules H2 ; (d) 7.79 x 1021 molecules H2O2
2. (a) 5.25 g NaOH; (b) 1.15 x 103 g lactose; (c) 82.1 g Fe; (d) 0.332 g NO2-
3. 6.54 x 1021 molecules of C3H8O3
4. 2.79 grams of NH3
5. 1.97 x 10-22 grams of Sn
Percent Composition
1. 60.00% C, 4.48% H, 35.52% O
2. 80.20% C, 8.35% H, 10.18% O
3. 6.01% H