One litre of an unknown gas weighs 1.25 g at N.T.P. which of the following gas pertains

One litre of an unknown gas weight 1.25 g at STP. Which one of the following can be the formula for the gas ?

One mole of oxygen gas weighs_____

One litre of a gas at STP weight 1.16 g it can possible be

One litre of a gas at S.T.P. weight 1.16 g. It can possibly be

11.2 litre of a gas at STP weighs 14 g The gas could not be

11.2 "litre" of a gas STP weighs 14 g . The gases would be: