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Molecular Mass Calculation Quiz

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Questions and Answers

What does the molecular mass of a substance represent?

The total number of protons in the molecule

The volume occupied by the substance

The sum of average atomic masses of all atoms in the molecule (correct)

The density of the substance

How is the molecular mass of a substance calculated?

Multiplying average atomic mass of each element by the number of its atoms and adding them together (correct)

Adding the number of protons and neutrons in each atom

Subtracting the atomic masses of different elements in the molecule

Dividing the total number of atoms by the number of elements

What is the molecular mass of carbon dioxide (CO2)?

$28.0$ u

$44.0$ u (correct)

$48.0$ u

$32.0$ u

In the molecule C6H5Cl, what does '6' represent?

Number of carbon atoms Signup and view all the answers

What is the molecular mass of H2SO4?

$98$ u Signup and view all the answers

What is the mass of one hydrogen atom in grams?

1.6736 × 10^-24 g Signup and view all the answers

In the present atomic mass system, what is the standard element used for determining atomic masses?

Carbon-12 Signup and view all the answers

What is the exact mass assigned to an atom of carbon-12 in the atomic mass unit system?

12.00000 amu Signup and view all the answers

How is an atomic mass unit (amu) defined in terms of the mass of a carbon-12 atom?

One twelfth of the mass of one carbon-12 atom Signup and view all the answers

What unit has recently replaced the atomic mass unit (amu) and is symbolized by 'u' or 'Da'?

Dalton Signup and view all the answers