3. Chemical Reactions
Molecular Formula
3. Chemical Reactions
Molecular Formula - Video Tutorials & Practice Problems
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The molecular formula gives the actual number of atoms.
Molecular Formula
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Molecular Formula
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example
Molecular Formula
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Problem
ProblemUse the given empirical formula and molar mass to determine the molecular formula.
Empirical Formula: NH2 Molar Mass: 32.052 g/mol
A
NH4
B
N4H
C
NH2
D
N2H4
4
Problem
ProblemGlyceraldehyde (M = 90.078 g/mol), a simple monosaccharide, is comprised of 39.999% C, 6.714% H, and 53.297% oxygen by atomic weight. What would be its molecular formula?
A
C3H6O3
B
CH2O
C
C3HO3
D
C2H8O2
5
Problem
ProblemElemental analysis of a pure compound indicated that the compound had 72.2% C, 8.50% H and the remainder as O. If 0.250 moles of the compound weighs 41.55 g, what is the molecular formula of the compound?
A
C5H7O
B
C10H14O2
C
C6H8O2
D
C12H16O4
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PRACTICE PROBLEMS AND ACTIVITIES (67)
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- The following diagram represents an ionic compound in which the red spheres represent cations and the blue sph...
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- Lactic acid forms in muscle tissue after strenuous exercise. Elemental analysis shows that lactic acid is 40.0...
- Write a chemical formula for each molecular model. (See Appendix IIA for color codes.) (c)
- Write a chemical formula for each molecular model. (See Appendix IIA for color codes.) (a)
- Each of the pictures (a)–(d) represents one of the following substances at 25 °C: sodium, chlorine, iodine, so...
- Fluoxetine, marketed as an antidepressant under the name Prozac, can be represented by the following ball-and-...
- The following ball-and-stick molecular model is a representation of acetaminophen, the active ingredient in su...
- The following ball-and-stick molecular model is a representation of thalidomide, a drug that causes birth defe...
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- Give molecular formulas corresponding to each of the following ball-and-stick molecular representations (red =...
- Give molecular formulas corresponding to each of the following ball-and-stick molecular representations (red =...
- Give molecular formulas corresponding to each of the following ball-and-stick molecular representations (red =...
- In the following drawings, red spheres represent cations, and blue spheres represent anions. Match the drawing...
- Ball-and-stick representations of benzene, a colorless liquid often used in organic chemistry reactions, and a...
- What is the molecular formula of each of the following compounds? (b) empirical formula OH, molar mass 5 34....
- What is the molecular formula of each of the following compounds? (b) empirical formula NH2, molar mass 5 32...
- What is the molecular formula of each of the following compounds? (a) empirical formula CH3O, molar mass 5 6...
- Determine the empirical and molecular formulas of each of the following substances: (a) Styrene, a compound us...
- Determine the empirical and molecular formulas of each of the following substances: (c) Monosodium glutamate...
- Determine the empirical and molecular formulas of each of the following substances: (b) Caffeine, a stimulant ...
- Write the molecular and structural formulas for the compounds represented by the following molecular models:
- Determine the empirical and molecular formulas of each of the following substances: (c) Epinephrine (adrenal...
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- Determine the empirical and molecular formulas of each of the following substances: (a) Ibuprofen, a headache ...
- Write the molecular and structural formulas for the compounds represented by the following models:
- Write a ratio showing the relationship between the molar amounts of each element for each compound. (See Appe...
- An unknown liquid is composed of 5.57% H, 28.01% Cl, and 66.42% C. The molecular weight found by mass spectrom...
- An unknown liquid is composed of 34.31% C, 5.28% H, and 60.41% I. The molecular weight found by mass spectrome...
- Cinnamaldehyde is a compound that is responsible for the characteristic aroma of cinnamon. It contains 81.79%...
- From the given empirical formula and molar mass, find the molecular formula of each compound. a. C6H7N, 186.24...
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- From the given molar mass and empirical formula of several compounds, find the molecular formula of each compo...
- Disilane, Si2Hx, is analyzed and found to contain 90.28% silicon by mass. What is the value of x?
- A certain metal sulfide, MS2, is used extensively as a high-temperature lubricant. If MS2 is 40.06% sulfur by ...
- The stimulant amphetamine contains only carbon, hydrogen, and nitrogen. Combustion analysis of a 42.92 mg samp...
- The molecular weight of an organic compound was found by mass spectrometry to be 70.042 11. Is the sample C5H1...
- From the molecular structures shown here, identify the one that corresponds to each of the following species: ...
- b) Given the mass spectrum of benzene, identify the molec-ular weight and give the molecular formula.
- (b) An elemental analysis of the acid indicates that it is composed of 5.89% H, 70.6% C, and 23.5% O by mass. ...
- A pulverized rock sample believed to be pure calcium carbonate, CaCO3, is subjected to chemical analysis and f...
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- The structural formula of isopropyl alcohol, better known as 'rubbing alcohol,' is shown. What is the chemical...
- Lactic acid, a compound found both in sour milk and in tired muscles, has the structure shown. What is its che...
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- Find the molecular formula of each compound
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- Elemental analysis of the unknown gas from part a revealed that it is 30.45% N and 69.55% O by mass. What is t...
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- Determine the empirical formula for the compound represented by each molecular formula.
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