Question

This is my chemistry worksheet. It's a new topic my teacher will barely review with us. Help please???

Answer 1

So to balance an equation, you need to get the same amount of each type of element on either side of the --> . So you pretty much are given the subscripts in the equations and you need to add coefficients (just normal numbers) in front of any formula that needs it, keeping anything balance.

`KCl_(3) + O_(2) -\ \textgreater \ KCl_(3)`
turns into

`2KCl_(3)+ 3O_(2) -> 2KCl_(3)`

These coefficient numbers are the molar ratios, so 2 moles of KCl3 for every 3 moles of O2 so 1. 3:2

Then you can use these ratios of find out how many moles of one thing are needed if you are given the amount of another.

`(moles of element 1)/(cofficient 1) = (moles of element 2)/(cofficient 2)`
and use cross multiplication to solve for whatever you don't know