190,111 views
22 votes
22 votes
Which of the following correctly gives the best coefficients for the reaction below?

Which of the following correctly gives the best coefficients for the reaction below-example-1
User Arvind Krmar
by
3.1k points

1 Answer

18 votes
18 votes

So, let's balance the following chemical reaction:

To balance a chemical equation, we could follow the steps:

1. We need to check that the number of atoms of each element before and after the reaction takes place, be the same. So, let's start to count:

As you can see, the numbers for each element are not the same so we need to balance the equation. Remember: When balancing a chemical reaction, we can change the coefficiens but we can't change the subscripts. And, we could balaance in the following order: Metals, nonmetals, hydrogen and oxygen.

In this case, let's start balancing Al and K, and then S:

Finally, you can notice that K is not balanced now, so we could multiply the coefficient 2*3 which gives us 6. And, if we make this change and count again, the balanced reaction will be:

And, the best coefficients are: 1,6,2,3.

Answer D is correct.

Which of the following correctly gives the best coefficients for the reaction below-example-1
Which of the following correctly gives the best coefficients for the reaction below-example-2
Which of the following correctly gives the best coefficients for the reaction below-example-3
Which of the following correctly gives the best coefficients for the reaction below-example-4
Which of the following correctly gives the best coefficients for the reaction below-example-5
User Axis
by
2.9k points