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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Describe the steps you would take to calculate the relative molecular mass of a compound given its chemical formula and the relative atomic masses of its elements.
Explain why the relative atomic mass of an element is important in chemistry.
Explain why the relative atomic mass of an element is not always a whole number.
Explain why the relative molecular mass of a compound is important in chemical calculations.
The relative atomic mass of magnesium is 24.3. What does this value represent?
A molecule of glucose has the formula C6H12O6. Calculate its relative molecular mass. (C = 12, H = 1, O = 16)
A sample contains 60% 63Cu (relative atomic mass = 63) and 40% 65Cu (relative atomic mass = 65). Calculate the relative atomic mass of copper.
A sample of chlorine contains 75% 35Cl (relative atomic mass = 35) and 25% 37Cl (relative atomic mass = 37). Calculate the relative atomic mass of chlorine.
Which of the following best describes the difference between mass number and relative atomic mass?
(1) Mass number is an average, relative atomic mass is a whole number
(2) Mass number is the total number of protons and neutrons, relative atomic mass is a weighted average of isotopes
(3) Mass number is measured in grams, relative atomic mass is not
(4) There is no difference
Which of the following best explains why isotopes of the same element have different relative atomic masses?
(1) They have different numbers of protons
(2) They have different numbers of neutrons
(3) They have different numbers of electrons
(4) They have different chemical properties
Which of the following is NOT true about relative atomic mass?
(1) It is always a whole number
(2) It is a weighted average
(3) It is based on the carbon-12 scale
(4) It takes into account isotopic abundance
Which of the following is the correct relative molecular mass of carbon dioxide (CO2)? (C = 12, O = 16)
(1) 28
(2) 32
(3) 44
(4) 48
Fill in the blank: The relative atomic mass of an element is based on the mass of the ________ isotope.
Fill in the blank: The relative atomic mass of carbon is exactly ________ by definition.
Fill in the blank: The relative atomic mass of hydrogen is approximately ________.
Fill in the blank: The relative atomic mass of oxygen is approximately ________.
Is the following statement true or false? The relative atomic mass of an element can be a decimal number.
True or False: The relative atomic mass of an element is always the same as its mass number.
True or False: The relative atomic mass of chlorine is not a whole number because it is an average of the masses of its isotopes.
True or False: The relative molecular mass of a compound is the sum of the relative atomic masses of all the atoms in its formula.
