3.
CaCl2
Balance the equation
---CaCO3 + --___-_HCI —_-_-_CaCl2 + __CO2 + _H20
A. 1; 1; 1; 1; 1
B. 2; 1; 2; 1; 1
C. 1; 2; 1; 1; 1
D. 1; 2; 2; 1; 1
O

Hey there!

CaCO₃ + HCl → CaCl₂ + CO₂ + H₂O

We have to balance Ca, C, O, Cl, and H.  

Let's balance H.

One on the left, two on the right. Add a coefficient of 2 in front of HCl.

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O  

Balance Ca.

One on the left, one on the right. Already balanced.

Balance C.

One on the left, one on the right. Already balanced.

Balance O.

Three on the left, three on the right. Already balanced.

Balance Cl.

Two on the left, two on the right. Already balanced.

Our final balanced equation:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

The answer is C. 1; 2; 1; 1; 1.

Hope this helps!

C.)

Explanation: