Answer:
The mass fraction of ferric oxide in the original sample :
Explanation:
Mass of the mixture = 3.110 g
Mass of 
Mass of 
After heating the mixture it allowed to react with hydrogen gas in which all the ferric oxide reacted to form metallic iron and water vapors where as aluminum oxide did not react.

Mass of mixture left after all the ferric oxide has reacted = 2.387 g
Mass of mixture left after all the ferric oxide has reacted = y

The mass fraction of ferric oxide in the original sample :

Hydroxide ion is a strong and would react with H+ to form water
OH-+H+---->H2O
Water containing carbonic acid and calcium
Answer:
this doesnt make sence ezxplain the subject
Explanation:
Answer: c. balance
Explanation: Mass is the amount of matter contained in a body.