Two sealed flasks with the same volume are left side by side.
Flask A contains 4.0 × 10$^{-3}$ mol of methane.
Flask B contains 340 mg of a different gas.
Both gases are at the same temperature and pressure.
Which gas could be in Flask B?
CH$_2$Cl$_2$
2 )
HBr
3 )
Kr
4 )
PF$_3$
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