## Homework F9

Michelle Chan 1J
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

### Homework F9

For F9, I understand all the steps until you multiply to get the molecular formula. How do you know to multiply 3? Do you just keep multiplying until you get whole coefficients?

Mansi_1D
Posts: 50
Joined: Fri Aug 02, 2019 12:15 am

### Re: Homework F9

It's always been 3 so far for me for all the problems I have solved, so I would test 3 first. However, this doesn't have to be the case every time so you would just keep multiply until you get a whole number.

Zaynab Hashm 2I
Posts: 110
Joined: Wed Sep 11, 2019 12:15 am
Been upvoted: 1 time

### Re: Homework F9

You don't always have to multiply it by 3, it could be 2, for example. You just have to make sure you multiply by the smallest number possible to get whole integers.

MinuChoi
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

### Re: Homework F9

You can also try thinking of the decimals as fractions to help you decide what to multiply.
The decimals in the ratio for this problem are basically equivalent to thirds, so you would multiply by 3 to eliminate the fraction.

Cynthia Gong 1L
Posts: 51
Joined: Fri Aug 09, 2019 12:15 am

### Re: Homework F9

^^ The technique above is what I was taught -- basically think of all of the decimals as fractions where you have to get rid of the denominator