Which of the following chemical equations is balanced correctly?
a. C6H6 + O2 ---> 2CO2 + 3H2O
b. CS2 + 3CI2 ----> CCI4 + S2CI2
c. B2O3 +2C ---> B2C + CO
d. CI2 + NaI ----> 2NaCI + I2
To determine which of the chemical equations is balanced correctly, we need to check that the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side. Let's evaluate each equation:
a. For C6H6 + O2 ---> 2CO2 + 3H2O
Reactants: C = 6, H = 6, O = 2
Products: C = 2(1) = 2, H = 3(2) = 6, O = 2(2) + 3(1) = 4 + 3 = 7
This equation is not balanced because carbon and oxygen atoms are not balanced.
b. For CS2 + 3Cl2 ----> CCl4 + S2Cl2
Reactants: C = 1, S = 2, Cl = 3(2) = 6
Products: C = 1, S = 1(2) = 2, Cl = 4 + 2(2) = 8
This equation is not balanced because chlorine atoms are not balanced.
c. For B2O3 + 2C ---> B2C + CO
Reactants: B = 2, O = 3, C = 2
Products: B = 2, C = 1 + 1 = 2, O = 1
This equation is not balanced because oxygen atoms are not balanced.
d. For Cl2 + 2NaI ----> 2NaCl + I2
Reactants: Cl = 2, Na = 2, I = 2
Products: Cl = 2(1) = 2, Na = 2(1) = 2, I = 2
This equation is balanced because the number of each type of atom is the same on both the reactant and product sides.
Correct Answer: d. Cl2 + 2NaI ----> 2NaCl + I2