Chemistry Concepts Quiz

What does 1 mole of given particles weigh in comparison to the weight of one of those particles in amu?

• Twice the number of grams

• Half the number of grams

• The same number of grams

• Ten times the number of grams

If one molecule of H₂SO₄ weighs 98.1 amu, how much does one mole of H₂SO₄ weigh in grams?

• 50.0 grams

• 98.1 grams

• 100.0 grams

• 150.0 grams

What is the conversion factor used to convert between moles and grams?

• Avogadro's Number

• Molar mass

• Atomic number

• Molecular formula

What is the formula to convert mass (g) to moles?

• Divide by molar mass (g/mole)

• Multiply by molar mass (g/mole)

• Divide by Avogadro's number (particles/mole)

• Multiply by Avogadro's number (particles/mole)

How many atoms of lead, Pb, are in the sample?

• 1.20 x 10²² atoms

• 2.50 x 10²² atoms

• 3.01 x 10²² atoms

• 4.50 x 10²² atoms

How many formula units of CaCO₃ are in a 0.244 g sample of calcium carbonate?

• 1.47 x 10²¹

• 2.44 x 10²²

• 1.23 x 10²³

• 6.02 x 10²³

How many formula units of CaCO₃ are in a 0.244 g sample, according to the calculation?

• 1.47 x 10²³

• 6.02 x 10²³

• 2.50 x 10²³

• 3.01 x 10²³

What does each proton and neutron contribute to the mass of an atom?

• Approximately one amu

• Approximately two amu

• Approximately zero amu

• Approximately half an amu

What is the atomic number of Oxygen?

• 6

• 7

• 8

• 9

What is the symbol for the element with atomic number 12?

• Mg

• Mn

• Mo

• Md