The density of a gas is 1.43 g/L at STP. What is the gas? Chemistry?

The density of a gas is 1.43 g/L at STP. What is the gas?

As 1 mol of a gas at STP occupies volume of 22.4 L
Hence the mass of a gas of density 1.43 g/L = 22.4 x 1.43 = 32.032 g which is the molar mass of O2 gas.
At STP the density of that gas will be greatest which will be having highest molar mass.
Here SF6

1. O2
2. SF6

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