Molar Masses – Flashcards
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Which task most likely involves a calculation that uses moles?
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determining the number of atoms in a jar of liquid
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Which substance has the greatest molar mass?
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sodium chloride
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Which statement best describes the relationship between the substances in the equation? Na+ + Cl- NaCl
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The number of sodium ions is equal to the number of formula units of salt.
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How many atoms of aluminum are present in a sample that has a mass of 155.30 g?
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3.47 x 10^24
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Which statement best describes a mole?
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It is used for directly comparing the amounts of substances.
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In a classroom, which comparison would a teacher most likely use for describing a mole?
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a dozen eggs and a dozen jellybeans
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Which value gives the number of particles in 1 mol of a substance?
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6.02x 10^23
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If the molar mass of sodium nitrate (NaNO3) is calculated to be 85.00 g/mol, how many formula units are present in 11.0 g of sodium nitrate?
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7.79 x 10^22
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Avogadro's number was calculated by determining the number of atoms in
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12.00 g of carbon-12.
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The mole concept will most likely be used in
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determining how many ozone molecules are lost in the atmosphere.
