Chemical Calculations Flashcards
1
Q
What calculation proves the law of conservation of mass?
A
total mass of reactants = total mass of products
2
Q
What does relative formula (molecular) mass (Mr) equal?
A
Relative atomic mass (Ar)
3
Q
Why might substances seem to lose or gain mass when they react?
A
This is usually because a reactant or product is a gas.
