It contains only one type of molecule or
extended structure.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a