Ar,Mr, Balance equation, % and empirical formula

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 relative formula mass of NaOH?

• 20
• 39
• 40
• 45

Find Molecular Mass: Calculate the mass of one mole of CO₂ (carbon dioxide).

• 18.0 grams

• 44.0 grams

• 14.0 grams

• 180.0 grams

AgF....

• is an element because it has 2 different types of atoms.

• is a compound because it has 2 different types of atoms.

• is a compound because it has 2 of the same types of atoms.

• is an element because it has 2 of the same types of atoms.

What is the mass number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

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

What is the formula for iron(III) oxide?

• FeO
• Fe₃O
• Fe₃O₂
• Fe₂O₃

Calculate the mass of oxygen present in a 55g sample of Aluminum oxide, Al₂O₃.

• 29.28
• 19.95
• 25.88

• 32.33