Which one of the following chemical equations is balanced? a. 2nacl + h2so4 → hcl + naso4 b. 2na + s → 2nas c. koh + h2so4 → khso4 + h2o d. nh3 + h2o → 2nh4oh

To determine whether our equations are balanced, we must write the elements on the products side and also the reactants side. If the amount of the elements (coefficients and subscripts) are equal on both sides, we have a balanced equation. 

Lets try (A)

2NaCl + H₂SO₄ → HCl + NaSO₄

Na=2                    Na=1
Cl=2                    Cl=1
H=2                      H=1
Na=2                    Na=1
S=1                      S=1
O=4                     O=4
Most of the elements here are not equal for both sides, therefore, A is not the answer. 

Lets try (B)
2Na + S → 2NaS

Na=2        Na=2
S=1          S=2
This is a wrong answer because S is not equal on both sides. B is a wrong answer. 

Lets try (C)
KOH + H2SO4 → KHSO4 + H2O

K=1                       K=1                  
O= 1                     O=1
H=1                      H=1
H=2                     H=2
S=1                      S=1 
O=4                     O=4

THIS IS A BALANCED EQUATION

Since we already know that C is our answer, we have no need to check D. Also, D is incorrect because N has 1 on reactants side, and 2 on the other. Therefore, we automatically know that D is wrong.

FINAL ANSWER: C IS OUR ANSWER, IT IS A BALANCED EQUATION. :)

 

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