6. Quantitative Chemistry

What are you finding out if you add the relative atomic masses?

• molecular formula

• relative formula mass

• relative atomic mass

What is the relative formula mass of ammonium nitrate, NH4NO3 ?

[Relative atomic mass: N, 14; H, 1; O, 16]

• 76

• 79

• 80

• 90

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

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

Find Atomic Mass: What is the mass of one mole of Lithium (Li)?

• 6.9 grams

• 14.0 grams

• 22.9 grams

• 56.9 grams

A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?

• The mass of the balloon increases because the size of the balloon has increased.
• The mass of the balloon increases because the temperature of the balloon has increased.
• The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.

Tags

NGSS.MS-PS3-4