$X C l_{3}$ $XCl_3$ contains 67.2% chlorine by mass. Calculate the molar mass of X and identity the element. ?

Question

$X C l_{3}$ $XCl_3$ contains 67.2% chlorine by mass. Calculate the molar mass of X and identity the element. ?

1 Answer

Impact of this question

10103 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-10-04T00:19:08

Element $X$ $X$ has a molar mass of approximately $52$ $52$ $g m o l^{- 1}$ $gmol^-1$ and is chromium ( $C r$ $Cr$ ).

Explanation:

We can proceed as though we have one mole of $X C l_{3}$ $XCl_3$ .

The molar mass of chlorine is $35.5$ $35.5$ $g m o l^{- 1}$ $gmol^-1$ , and 3 mol of $C l$ $Cl$ will therefore have a mass of $3 \times 35.5 = 106.5$ $3xx35.5=106.5$ $g$ $g$ .

To find the mass of one mole of $X C l_{3}$ $XCl_3$ , when this makes up $67.2$ $67.2$ %, we multiply by $\frac{100}{67.2}$ $100/67.2$ :

$106.5 \times (\frac{100}{67.2}) = 158.48$ $106.5xx(100/67.2)=158.48$

This is the molar mass of one mole of $X C l_{3}$ $XCl_3$ . To find the molar mass of $X$ $X$ we subtract the mass of the chlorine:

$158.48 - 106.5 = 51.98$ $158.48-106.5=51.98$

We need the element whose molar mass is closest to $52$ $52$ . Looking at a periodic table, we find that that is chromium ( $C r$ $Cr$ ).

Science

Math

Humanities

... and beyond

$X C l_{3}$ $XCl_3$ contains 67.2% chlorine by mass. Calculate the molar mass of X and identity the element. ?

1 Answer

Explanation:

Related questions

Impact of this question

Science

Math

Humanities

... and beyond

XCl3XCl_3 contains 67.2% chlorine by mass. Calculate the molar mass of X and identity the element. ?

1 Answer

Explanation:

Related questions

Impact of this question

$X C l_{3}$ $XCl_3$ contains 67.2% chlorine by mass. Calculate the molar mass of X and identity the element. ?