What is the Density of Helium and oxygen? Will give 10 points to the first answer that sounds correct-ish

Question

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Answer 1

Oxygen is four times more dense than helium.

Answer 2

At STP: (Standard Temp. & Pressure [0 degrees Celsius and 101.325 kPa]):

Density of Helium: 0.1786 g/L

Density of Oxygen: 1.429 g/L

Answer 3

(at atmospheric pressure and room temp.)

oxygen- 1.3 * 10 to the negative third power

Helium- 1.8 * 10 to the negative fourth power