What is the mole fraction of h_2 in a mixture with a total pressure of 800 torr when the partial pressure of h_2 is 90 torr? a. 1.0 b. 8.8 c. 0.5 d. 0.11 e. 0.88

The correct answer is d) 0, 11

Explanation:

We use Dalton`s Law:

Partial Pressure = Total Pressurex mole fraction

90 torr = 800 torr x mole fraction

Mole fraction = 90 torr/ 800 torr= 0, 1125

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 !