Relative Masses Of Atoms And Molecules
Bayani Gaba-gaba
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.
Manufura
- 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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- 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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