Question

What volume does `7.54 * 10^25` atoms `Ne` occupy at STP?

Answer 1

Simple,
First conver `7.54 xx 10^25` atoms of Ne to moles

To do this, use the equation
Number of particles = Number of moles x Avogadro's constant

Since what we have to find out here is number of moles, rearrange the equation and solve for number of moles

Number of moles = Number of particles/Avogadro's Constant
`=7.54 xx 10^25//6.02 xx 10^23`
`= 125.24`
Thus, there are 125.24 moles in `7.54 xx 10^25` atoms of Ne

Now, the volume of anything at STP is equal to the number of moles multiplied by 22.4 L

Volume(at STP) = No. of moles x 22.4
`= 125.24 xx 22.4`
`= 2805 L//mol`
Thus, the volume is 2805 L/mol at STP for neon