# #XCl_3# contains 67.2% chlorine by mass. Calculate the molar mass of X and identity the element. ?

##### 1 Answer

Oct 4, 2017

Element

#### Explanation:

We can proceed as though we have one mole of

The molar mass of chlorine is

To find the mass of one mole of

This is the molar mass of one mole of

We need the element whose molar mass is closest to