Decide which element probably has a density most and least similar to the density of strontium.
comnarina density.

Explanation:

If we compare the density of strontium with all periodic table elements then the elements with very similar to the strontium density is Aluminium.

The density of aluminium is 2.698 g/cm³ while the density of strontium is 2.64 g/cm³.

While the least similar is Hassium. The estimated value of density of Hassium is 41 g/cm³. There is big difference between between both values.

If the given options are lead, indium, calcium and nitrogen than the elements with the density similar to the density of strontium is calcium.

The density of calcium is 1.54 g/cm³.

The elements with the density least similar to the density of strontium is  lead.

The density of lead is 11.342 g/cm³.

While the density of indium and nitrogen is 7.310 and 0.0012506  g/cm³ respectively.

It can be written as:

Most similar:  calcium, nitrogen, indium, lead.

Least similar: lead, indium, nitrogen, calcium.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.