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Chemistry (259)

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GasesComposition of Substances and SolutionsKinetics

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For a covalent compound, what other name may the formula mass correctly be given?Read the answer and worked solution →Chloroform is CHCl3. Using C = 12.01 amu, H = 1.008 amu and Cl = 35.45 amu, what is its molecular mass?Read the answer and worked solution →In one molecule of CHCl3, what total mass do the chlorine atoms contribute if Cl = 35.45 amu?Read the answer and worked solution →Aspirin has the molecular formula C9H8O4. With C = 12.01, H = 1.008 and O = 16.00 amu, what is its molecular mass?Read the answer and worked solution →

Worked practice questions

For a covalent compound, what other name may the formula mass correctly be given?

  1. It may also be called the percent composition
  2. It may also be called the molecular mass
  3. It may also be called the empirical formula
  4. It may also be called the molar concentration
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Correct answer: B. It may also be called the molecular mass

1. For a covalent substance the formula gives the numbers and types of atoms in one single molecule. 2. Because that formula describes a real molecule, its formula mass may correctly be called the molecular mass. 3. Percent composition is a set of mass percentages, not a mass, so it is a different quantity altogether. 4. Molar concentration measures solute per litre of solution and has nothing to do with a single molecule. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_

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Chloroform is CHCl3. Using C = 12.01 amu, H = 1.008 amu and Cl = 35.45 amu, what is its molecular mass?

  1. 48.47 amu
  2. 154.82 amu
  3. 119.37 amu
  4. 83.92 amu
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Correct answer: C. 119.37 amu

1. One chloroform molecule holds one carbon atom, one hydrogen atom and three chlorine atoms. 2. Carbon contributes 1 x 12.01 amu = 12.01 amu. 3. Hydrogen contributes 1 x 1.008 amu = 1.008 amu. 4. Chlorine contributes 3 x 35.45 amu = 106.35 amu. 5. Adding gives 12.01 + 1.008 + 106.35 = 119.37 amu. 6. The value 48.47 amu comes from counting only one chlorine atom instead of three. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_

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In one molecule of CHCl3, what total mass do the chlorine atoms contribute if Cl = 35.45 amu?

  1. 70.90 amu
  2. 35.45 amu
  3. 119.37 amu
  4. 106.35 amu
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Correct answer: D. 106.35 amu

1. The subscript 3 in CHCl3 shows three chlorine atoms per molecule. 2. Each chlorine atom has an average atomic mass of 35.45 amu. 3. The chlorine subtotal is 3 x 35.45 amu = 106.35 amu. 4. The figure 119.37 amu is the whole molecule, not just the chlorine share. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_

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