MOLE QUIZ

Read the questions carefully and choose the best answer.

Avogadro’s number of atoms of any element is equivalent to

• the atomic number of that element

• 6.02 x 10²³ particles

• the mass number of that element

• 100g of that element

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How can the knowledge about mole be useful for the environmentalists?

• Mole concept can be used in environmental monitoring.

• It gives information on the most dangerous pollutant in the atmosphere

• It gives a feedback on the kinds of pollutants present in the atmosphere.

• Mole concept can be used in quantifying the amount of pollutant-particles released in the

  atmosphere.

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The mole is an experimentally-defined unit. One mole is the number of particles found in 12.000

grams of:

• Carbon-12

• carbon-14

• oxygen

• hydrogen

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As the atomic masses of the elements in the periodic table increase, the number of atoms in

1 mol of each element

• decreases

• increases

• remains the same

• becomes a negative number

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How do you calculate the molecular weight of a compound?

• by dividing the weight of atoms of the compound

• by multiplying the weight of atoms of the compound

• by subtracting the weight of atoms of the compound

• by summing the atomic weights of elements in that compound

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Which of the following quantities would have the greatest mass: one mole of carbon atoms, one mole of neon atoms?

• one mole of carbon atoms

• one mole of helium atoms

• one mole of neon atoms

• they would have equal masses

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You were given a set of four test tubes. Each test tube contains 100 g sample of the following elements. If the elements are all monoatomic, which test tube contains the largest number of moles?

• Carbon

• Potassium

• Sodium

• Iron

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One gram molecule H₂O contains how many moles of molecules and number of molecules?

• 1 gram molecule H₂O = 1mol of molecule = 6.022 x 10 ²³ molecules of H₂O

• 1 gram molecule H₂O = 1.5 mol of molecule = 3.011 x 10²³ molecules of H₂O

• 1 gram molecule H₂O = 1.5 mol of molecule = 6.022 x 10 ²³ molecules of H₂O

• 1.5 gram molecule H₂O = 1mol of molecule = 6.022 x 10 ²³ molecules of H₂O

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The mass of the substance divided by its molar mass gives the ___________.

• ratio of the substance

• number of moles of the substance

• grams of the substance

• number of particles of the substance

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The atomic number of oxygen is 8. The atomic number of sulfur is 16. Compared with a mole of oxygen, a mole of sulfur contains

• twice as many atoms

• half as many atoms

• an equal number of atoms

• 8 times as many atoms