A gas sample has a volume of 25.0 milliliters at a temperature of 75.0°C and 1.00 atmosphere of
pressure. What will be the final temperature of
the gas (in degrees Kelvin) i the volume
increases to 50.0 milliliters and the pressure
remains constant.

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.

oxygen, selenium, tellurium, and polonium.

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