2.1 RELATIVE ATOMIC AND MOLECULAR MASS

The relative atomic mass is the average mass of an atom compared to 

• the mass of a carbon-12 atom.
• 1/12 the mass of a carbon-12 atom
• the mass of a hydrogen atom
• 1/12 the mass of a hydrogen atom

The relative molecular mass of a compound is equal to the sum of its

• Atomic mass
• Atomic number
• Oxidation number
• Valence electrons

What is the relative atomic mass of sodium?

• 11
• 23
• 46
• 64

What is the relative molecular mass of fluorine gas, F₂?

• 19
• 38
• 9
• 18

What is the unit of relative molecular mass?

• kilogram
• gram
• gram per mole (g/mol)
• no units

Each element is defined by the number of

• Atoms

• Isotopes

• Neutrons

• Protons

• Nuclei.

Tags

NGSS.HS-PS1-8

What is the relative atomic mass (A_r) of Chlorine (Cl)?

• 35.5

• 17

• 18.5

• 0.5

The atomic mass number of a specific element is determined by the:

• number of protons in its nucleus

• number of neutrons plus protons in its nucleus

• number of neutrons plus electrons in its nucleus

• number of electrons in its outermost shell

• total number of neutrons orbiting the nucleus

The formula of a compound is M(OH)₂. Given that the M_r of the compound is 98, calculate the A_r of M.

• 32
• 64
• 81
• 94

What is the atomic mass of magnesium?

• 2
• 4
• 12
• 24