(a) P4(b) H2O(c) Ca(NO3)2(d) CH3CO2H (acetic acid)(e) C12H22O11 (sucrose, cane sugar).

You are watching: What is the approximate percent by mass of oxygen in so3

123.896 amu

18.015 amu

164.086 amu

60.052 amu

342.297 amu

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PROBLEM (PageIndex4)

Determine the molecular mass the the following compounds:

(a) (b) (c) (d) 98.906 amu

26.018 amu

185.818 amu

98.072 amu

PROBLEM (PageIndex5)

Determine the molecular mass of the complying with compounds:

(a) (b) (c) (d) 56.107 amu

54.091 amu

199.9976 amu

97.9950 amu

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PROBLEM (PageIndex6)

Compare 1 mole the H2, 1 mole of O2, and 1 mole of F2.

(a) Which has actually the largest number of molecules? explain why.

(b) Which has the biggest mass? explain why.

1 mole is constantly 6.022 x 1023 molecules. They have the same number of molecules.

F2; it has actually the greatest molar mass

PROBLEM (PageIndex7)

Which consists of the greatest mass of oxygen: 0.75 mol that ethanol (C2H5OH), 0.60 mol of formic acid (HCO2H), or 1.0 mol of water (H2O)? define why.

Formic acid. Its formula has twice as plenty of oxygen atoms together the various other two compounds (one each). Therefore, 0.60 mol the formic acid would certainly be tantamount to 1.20 mol of a link containing a solitary oxygen atom.

PROBLEM (PageIndex8)

Calculate the molar fixed of each of the following:

(a) S8(b) C5H12(c) Sc2(SO4)3(d) CH3COCH3 (acetone)(e) C6H12O6 (glucose)

256.528 g/mol

72.150 g/mol

378.103 g/mol

58.080 g/mol

180.158 g/mol

PROBLEM (PageIndex9)

Calculate the molar fixed of each of the following:

(a) the anesthetic halothane, C2HBrClF3(b) the herbicide paraquat, C12H14N2Cl2(c) caffeine, C8H10N4O2(d) urea, CO(NH2)2(e) a usual soap, C17H35CO2Na

197.382 g/mol

257.163 g/mol

194.193 g/mol

60.056 g/mol

306.464 g/mol

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PROBLEM (PageIndex10)

Determine the variety of moles the compound and also the variety of moles that each form of atom in each of the following:

(a) 25.0 g the propylene, C3H6(b) 3.06 × 10−3 g of the amino mountain glycine, C2H5NO2(c) 25 lb that the herbicide Treflan, C13H16N2O4F (1 lb = 454 g)(d) 0.125 kg the the insecticide Paris Green, Cu4(AsO3)2(CH3CO2)2(e) 325 mg the aspirin, C6H4(CO2H)(CO2CH3)

0.595 mol C3H6

1.78 mol C

3.57 mol H

4.08 × 10-5 mol C2H5NO2

8.16 × 10-5 mol C

2.04 × 10-4 mol H

4.08 × 10-5 mol N

8.16 × 10-5 mol O

40.106 mol C13H16N2O4F

521.37 mol C

641.70 mol H

80.212 mol N

160.42 mol O

40.106 mol F

0.202 mol Cu4(AsO3)2(CH3CO2)2

0.808 mol Cu

0.404 mol As

2.02 mol O

0.808 mol C

1.212 mol H

0.00181 mol C6H4(CO2H)(CO2CH3)

0.01625 mol C

0.0144 mol H

0.0072 molO

PROBLEM (PageIndex11)

Determine the mass of each of the following:

(a) 0.0146 mol KOH(b) 10.2 mol ethane, C2H6(c) 1.6 × 10−3 mol Na2 SO4(d) 6.854 × 103 mol glucose, C6 H12 O6(e) 2.86 mol Co(NH3)6Cl3

0.819 g

307 g

0.23 g

1.235 × 106 g (1235 kg)

765 g

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PROBLEM (PageIndex12)

Determine the variety of moles of the compound and also determine the variety of moles of each kind of atom in each of the following:

(a) 2.12 g that potassium bromide, KBr(b) 0.1488 g that phosphoric acid, H3PO4(c) 23 kg that calcium carbonate, CaCO3(d) 78.452 g of aluminum sulfate, Al2(SO4)3(e) 0.1250 mg of caffeine, C8H10N4O2

0.0178 mol KBr

0.0178 mol K

0.0178 mol Br

0.00152 mol H3PO4

0.00455 mol H

0.00152 mol P

0.00607 mol O

230 mol CaCO3

230 mol Ca

230 mol C

690 mol O

0.229 mol Al2(SO4)3

0.459 mol Al

0.688 mol S

2.75 mol O

6.44 × 10-7 mol C8H10N4O2

5.15 × 10-6 mol C

6.44 × 10-6 mol H

2.58 × 10-6 mol N

1.29 × 10-6 molO

PROBLEM (PageIndex13)

The approximate minimum daily dietary necessity of the amino acid leucine, C6H13NO2, is 1.1 g. What is this requirement in moles?

0.0084 mol C6H13NO2

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PROBLEM (PageIndex14)

Determine the fixed in grams of every of the following:

(a) 0.600 mol that oxygen atoms(b) 0.600 mol that oxygen molecules, O2(c) 0.600 mol that ozone molecules, O3

9.60 g

19.2 g

28.2 g

PROBLEM (PageIndex15)

A 55-kg woman has actually 7.5 × 10−3 mol of hemoglobin (molar massive = 64,456 g/mol) in her blood. How many hemoglobin molecules is this? What is this quantity in grams?

4.52 × 1021 molecules of hemoglobin

483.42 g the hemoglobin

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PROBLEM (PageIndex16)

One 55-gram offer of a details cereal offers 270 mg the sodium, 11% of the recommended everyday allowance. How numerous moles and atoms the sodium space in the recommended day-to-day allowance?

0.107mol Na; 6.45× 1022atoms Na

PROBLEM (PageIndex17)

A pipe of toothpaste contains 0.76 g of sodium monofluorophosphate (Na2PO3F) in 100 mL.

What massive of fluorine atoms in mg to be present? How plenty of fluorine atoms to be present? Answer a

100.27 mg F

3.18 × 1021 atom F

PROBLEM (PageIndex18)

Which of the complying with represents the least variety of molecules?

20.0 g that H2O (18.02 g/mol) 77.0 g the CH4 (16.06 g/mol) 68.0 g of CaH2 (42.09 g/mol) 100.0 g the N2O (44.02 g/mol) 84.0 g that HF (20.01 g/mol) Answer

20.0 g that H2O represents the smallest number of moles, definition the least variety of molecules present. Since 1 mole = 6.022 × 1023 molecule (or atoms) regardless of identity, the least variety of moles will equal the least variety of molecules

PROBLEM (PageIndex19)

Calculate the following:

(a) the percent ingredient of ammonia, NH3(b) the percent ingredient of photographic “hypo,” Na2S2O3(c) the percent of calcium ion in Ca3(PO4)2

% N = 82.24%

% H = 17.76%

% Na = 29.08%

% S = 40.56%

% O = 30.36%

% Ca2+ = 38.76%

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PROBLEM (PageIndex20)

A compound of carbon and also hydrogen consists of 92.3% C and has a molar massive of 78.1 g/mol. What is its molecule formula?

C6H6

PROBLEM (PageIndex21)

Dichloroethane, a compound that is frequently used for dry cleaning, includes carbon, hydrogen, and also chlorine. It has actually a molar massive of 99 g/mol. Evaluation of a sample shows that it has 24.3% carbon and 4.1% hydrogen. What is its molecular formula?

C2H4Cl2

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In the second edition, this trouble was moved. The number in the location of the video may it is in incorrect, yet the systems is correct.

See more: Physical Precipitation Of Gypsum Due To Evaporation, Gypsum Precipitation Under Saline Conditions

## Contributors

Adelaide Clark, Oregon institute of Technology