Show how you would work carry out this calculation: 1.96g of an unknown hydroxide X(OH)2 was dissolved in water, and the solution was made up to 250.00cm in a volumetric flask. In a titration, 25.00cm of this solution of
X(OH)2 required 21.20cm of 0.250 mol dm' HCl(aq) to reach the end point.
Equation: 2HCl(aq) + X(OH)2(aq) → XC12(aq) + 2H2O(1)
2021 XChalones
Identify the unknown hydroxide X(OH)2

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 !

there are two significant figures.