Relative Masses Of Atoms And Molecules
Muhtasari
Atoms are far too small to weigh one at a time, so chemists compare their masses instead. By measuring every atom against one-twelfth of a carbon-12 atom, we get a simple scale of relative masses that lets us add up the mass of any molecule and predict how much product a reaction will make.
In this lesson you will learn what relative atomic mass and relative molecular mass mean, how to calculate the relative molecular mass of a compound, and how to use simple proportion to work out reacting masses. No mole calculations are needed here, just careful arithmetic and clear reasoning.
Malengo
- Describe relative atomic mass, A , as the r average mass of the isotopes of an element compared to 1/12th of the mass of an atom of 12C.
- Define relative molecular mass, M , as the sum r of the relative atomic masses. Relative formula mass, M , will be used for ionic compounds r.
- Calculate reacting masses in simple proportions. Calculations will not involve the mole concept.
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Hongera kwa kukamilisha somo la Relative Masses Of Atoms And Molecules. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
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- Relative atomic mass compares the average mass of an element's isotopes with: A. The mass of a hydrogen atom B. One-twelfth of the mass of a carbon-12 atom C. The mass of an oxygen atom D. One gram Answer: B
- What is the relative molecular mass of water, H2O? (Ar: H = 1, O = 16) A. 17 B. 18 C. 19 D. 34 Answer: B
- What is the relative molecular mass of carbon dioxide, CO2? (Ar: C = 12, O = 16) A. 28 B. 32 C. 44 D. 56 Answer: C
- What mass of carbon dioxide is formed when 12 g of carbon burns completely in oxygen? (C + O2 -> CO2) A. 12 g B. 22 g C. 32 g D. 44 g Answer: D
- The term used for the sum of relative atomic masses in an ionic compound is: A. Relative atomic mass B. Relative formula mass C. Molar volume D. Avogadro number Answer: B
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Sehemu ya kitabu
Formula Mass and the Mole Concept
Calculate formula masses for covalent and ionic compounds
"Chemistry: Formula Mass and the Mole Concept" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/3-1-formula-mass-and-the-mole-concept. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Sehemu ya kitabu
Atomic Structure and Symbolism
Write and interpret symbols that depict the atomic number, mass number, and charge of an atom or ion
"Chemistry: Atomic Structure and Symbolism" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/2-3-atomic-structure-and-symbolism. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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