MgF₂ ( <span>Magnesium fluoride )
hope this helps!</span>
The sum of the masses of the reactants must equal the sum of the masses of the products; as required by
the Principle of Conservation of Mass.
I would say d but I’m not sure
Answer:

Explanation:
Given


Required
Determine the percentage error
First, we need to determine the difference in the measurement




The percentage error is calculated as thus:




<em>approximated</em>
C. The mass number is the amount of Protons and electrons there are combined, so 200 - 80 is 120.