Relative Atomic Mass and Relative Molecular Mass
Chemistry ⇒ Atomic Structure and the Periodic Table
Relative Atomic Mass and Relative Molecular Mass starts at 9 and continues till grade 12.
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See sample questions for grade 9
A molecule of nitrogen gas (N2) contains two nitrogen atoms. What is its relative molecular mass? (N = 14)
A sample contains 60% isotope X (mass = 20) and 40% isotope Y (mass = 22). What is the relative atomic mass of the element?
A sample of chlorine contains 75% Cl-35 (relative atomic mass = 35) and 25% Cl-37 (relative atomic mass = 37). Calculate the relative atomic mass of chlorine.
Calculate the relative molecular mass (Mr) of water (H2O). (Relative atomic masses: H = 1, O = 16)
Calculate the relative molecular mass of calcium carbonate (CaCO3). (Ca = 40, C = 12, O = 16)
Calculate the relative molecular mass of carbon dioxide (CO2). (C = 12, O = 16)
Calculate the relative molecular mass of ethane (C2H6). (C = 12, H = 1)
Calculate the relative molecular mass of magnesium hydroxide, Mg(OH)2. (Mg = 24, O = 16, H = 1)
Calculate the relative molecular mass of methane (CH4). (C = 12, H = 1)
Describe the difference between relative atomic mass and relative molecular mass.
Explain how the relative atomic mass of an element is calculated if it has more than one isotope.
Explain why the relative atomic mass of an element is often not a whole number.
What is meant by the term 'relative atomic mass'?
