The element oxygen would be expected to form covalent bond(s) in order to obey the octet rule. use the octet rule to predict the formula of the compound that would form between oxygen and hydrogen , if the molecule contains only one oxygen atom and only single bonds are formed. formula:

the answer is definitely c.

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.