A Plastic Bag Is Weighed and Then Filled Successively with Two

A plastic bag is weighed and then filled successively with two gases, X and Y. The following data are gathered:
Temperature: 0.0°C
Pressure: 1.00 atm
Mass of empty bag: 20.77 g
Mass of bag filled with gas X: 24.97 g
Mass of 1.12 L of air at conditions given: 1.30 g
Volume of bag: 1.12 L
Molar volume at STP: 22.4 L
-The mass of 1.12 L of gas Y is found to be 6.23 g. The density of gas Y is

A) 0.180 g/L.
B) 0.200 g/L.
C) 10.6 g/L.
D) 15.6 g/L.
E) 5.56 g/L.