A scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed to be XBr 3 where X is the unknown metal. The scientist determined that a 4.735 g sample of this compound contains 4.760 * 10 - 2 mol Br. Calculate the atomic mass of the unknown metal, X.

The₍compound of unknown metal is XBr₃

we shall calculate how much of X reacts with 3 x 80 g of Br. It will be equal to atomic weight of X ...

4.760 x 10⁻² mol of Br = 4.760 x 10⁻² x 80 gram of Br

= 3.808g

So 4.735 g of sample contains 3.808 g of Br and (4.735 - 3.808) =.927 g of metal

3.808 g of Br reacts with. 927 g of metal X

3 X 80 g of Br will react with (.927 / 3.808) x 3 x 80 g of metal X

= 58.42 g of X

So atomic weight = 58.42 g