Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (don't forget to include coefficients of one.) al + h2so4 → al2(so4)3 + h2

9

Explanation:

To balance the equation, we need to supply the number of missing coefficients.

There are 2 moles of aluminium on the right hand side, so automatically we need to multiply the number of moles of aluminium by 2 on the left hand side.

There are 3 sulphate ions on the right hand side so we need to multiply the number on the left by 3.

And lastly since we have 6 hydrogen molecules on the left hand side now, we need to multiply the hydrogen on the right hand side by 3 to give 6

The set of coefficients = 2 3 1 3

Adding all thus yields 9

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

i do not get it   at all