As a final problem for the week snape thinks we should incorporate something from a previous week, hydrates perhaps. suppose we have a compound that is 4.330 % li, 22.10 % cl, 39.89 % o, and 33.69 % h2o. what is the compounds formula?

The  formula is =

Explanation:

% of Li = 4.330

Molar mass of Li = 6.941 g/mol

% moles of Li = = 0.62382

% of Cl = 22.10

Molar mass of Cl = 1.00784 g/mol

% moles of Cl = = 0.62336

% of O = 39.89

Molar mass of O = 15.999 g/mol

% moles of O = = 2.49328

% of H₂O = 33.69

Molar mass of H₂O = 18.01528 g/mol

% moles of H₂O = = 1.87007

Taking the simplest ratio for Li , Cl, O, and H₂O as:

0.62382 : 0.62336 : 2.49328 :  1.87007

= 1 : 1 : 4 : 3

The  formula is =

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !