## Chemistry and Chemical Reactivity (9th Edition)

A) Not a gas:$V\propto 1/P$, so the volume should increase approximately 100 times, not 1$\%$. B) Insufficient information: At STP condition, air density is 1.27 g/L; this sample has a value of 8200 g/L, so unless it's at very high pressure and low temperature, it's not a gas. C) Insufficient information: not related to the material's state of matter. D) It's a gas, for it has the same molar density at the same Temperature and Pressure as air.