Calculation Mistakes

Question 1

Remember empirical formula what is it

Answer 1

This is the SIMPLEST whole number ratio of ATOMS in a molecule, not just 1 molecule? (Stupid yute)

Once found the empirical formula, if you know the molar mass, divide by empirical and multiply EACH ATOM by it to get the molecular formula of the molecule

Question 2

Now when making new compounds, don’t worry about balancing .

Once we have the molecular formula in set , then later down the line we can easily balance no problem

Answer 2

Also don’t stress it they can’t make it super hard, so do what you do and then BALANCE

Like we had 1FE made Fe2O3, and we knew Fe2O3 had to be correvt

Not a case that 1FE wrong, we can just balance later, and this Fe can come from multiple molecules

Remember it said D became E, not how many D, so STILL VALID

Conclusion : don’t worry about atoms, once have everything then balance and leave it

Question 3

When ever doing a water of crystallisation find the water q what to do

Answer 3

Don’t lack, find the mole ratios divide and then you have rhe EXACT stoiciometry

And don’t think too deep, this is correct and move on

Question 4

How to do finding molecule formula qs

Answer 4

Don’t overthink, always chekc if answer can be written as Mut,piles of other atoms and give this answer

Question 5

How to do find the molecular formual questions

Answer 5

Don’t overthink, first check your moelcuslr mass can be written as a multiple of the other atoms somehow, if not then try something elee

Question 6

How to do uncertainty q for tire

Answer 6

Multiply uncertainty by 2 , as remeberin physics when subtracting ADD UNCERTAINTIES and then find percentage