Question

0.25 mole of an element X' is 9.75 g. What is X
​

Answer 1

Answer:

have a nice day ahead

Answer 2

Given:

Moles of element X $=0.25mol$

Mass of element X $=9.75g$

To Find: Element X

Solution:

Number of moles can be given as:

$\[No.\,of\,moles = \frac{{Mass}}{{Molar\,Mass}}\]$

Therefore, the molar mass of the element can be given as:

$\[Molar\,Mass = \frac{{Mass}}{{No.\,of\,moles}}\]$

$\[Molar\,Mass = \frac{{9.75\,g}}{{0.25\,mol}}\]$

$\[Molar\,Mass = 39\,g/mol\]$

The element having a molar mass approximately equal to 39 is potassium.

Hence, the element X is $K$ (potassium).