Question

If 3.89 × 1024 atoms of a noble gas is collected and it has a mass of of 848 grams, this element is most likely a. He b. Ne c. Ar d. Kr

Answer 1

Xenon

Step-by-step explanation:

Avogadro’s number represent the number of the constituent particles which are present in one mole of the substance. It is named after scientist Amedeo Avogadro and is denoted by
`N_0`.

Avogadro constant:-

`N_a=6.023* 10^(23)`

Let the molar mass of the element is x g/mol

So,

`6.023* 10^(23)` atoms have a mass of x g

Also,

`3.89* 10^(24)` atoms have a mass of
`(x)/(6.023* 10^(23))* 3.89* 10^(24)` g

This mass is equal to 848 g

So,

`(x)/(6.023* 10^(23))* 3.89* 10^(24)=848`

x= 131.3 g/mol

This mass correspond to xenon.