Edexcel 1e - Calculating the formula 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

What is the atomic mass of magnesium?

• 2
• 4
• 12
• 24

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

The chemical formula of potassium hexacyanoferrate (III) is K₃Fe(CN)₆. What is the relative formula mass?

RAM [ K=39, Fe=56, C= 12, N= 14]

• 121

• 199

• 251

• 329

Using your periodic Table, calculate the formula mass of N₂.

Answer:

(a)  

Using your periodic Table, calculate the formula mass of CH₄.

Answer:

(a)  

Using your periodic Table, calculate the formula mass of CaCO₃.

Answer:

(a)  

Using your periodic Table, calculate the formula mass of NH₃.

Answer:

(a)  

Using your periodic Table, calculate the formula mass of Fe₂O₃.

Answer:

(a)