19. When 0.5g of calcium trioxocarbonate (IV) was added to excess dilute
hydrochloric acid, carbon (IV) oxide was evolved. The entire reaction took
5minutes. What was the rate of reaction?
A. 0.01gmin-1
B. 0.1gmin-1
C. 0.2gmin-1
D. 0.02gmin-1
E 0.3gmin-1
please help!!