Galen lists the properties of four covalent compounds and two ionic compounds in the table below. Compounds Boiling point °C Elemental composition Type of compound
H2O 100.0 all nonmetals covalent
CS2 46.3 all nonmetals covalent
CH4 −161.5 all nonmetals covalent
HCl −85.1 all nonmetals covalent
NaCl 1413.0 a metal and a nonmetal ionic
KCl 1420.0 a metal and a nonmetal ionic

If his teacher asks him about a different covalent compound, what can he predict about its properties? Select all that apply.

A.
It consists of all metals.

B.
It has a high boiling point.

C.
It has a low boiling point.

D.
It consists of all nonmetals.

E.
It consists of all semimetals.

F.
It consists of nonmetals and metals.

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).

a is the correct answer