- #1
Saracen Rue
- 150
- 10
Homework Statement
An unknown compound weighs 1.023 kg. It is known that element X composes 28.3% of the compound. Given that the molar mass is 240.5 g/mol, find element X.
Homework Equations
mole = mass / atomic weight
(n = m / Ar)
mole = mass / molecular weight
(n = m / Mr)
mole = number of particles / Avogadro's number
(n = P / NA)
The Attempt at a Solution
I tried solving using the first equation, but I don't know them mass, Ar or mole of element X. I solved for the mole of the substance using the second equation, but I don't know how to find the unknown element from there. I don't think the last equation is applicable in this particular case, but I included it just in case.