Question

Ca (s) + 02 (g) 2CaO (s)
O A. 4,1,2
O B. 3,1,2
• C. 2,1,2
O D. 1,1,2

Answer 1

C. 2,1,2

Step-by-step explanation:

Ca(s) + O₂ (g) →2CaO(s)

on the reactants side:

1 Ca

2 O (because the subscript 2 counts as there being 2 O molecules. if you put a 2 in front of the O₂ that would be 2x2=4)

On the product side:

2Ca

2O

you would just need to add a 2 to the Ca on the reactants side to balance the equation.

I hope this helps!

Answer 2

The answer is C.2,1,2

Step-by-step explanation:

The reason why the answer is C.2,1,2 is because if you put a 2 Infront of the first calcium it will be balanced with the calcium in the product side and if you put one in front of the oxygen that wiil be two and it will also be balanced with the oxygen on the product side and seeing that a 2 the coefficient is already on the product side the equation is already balanced