- #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 / molecular weight

(n = m / Mr)

mole = number of particles / Avogadro's number

(n = P / NA)

*mole = mass / atomic weight*

(n = m / Ar)(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.*