density UB Forum › Category: Mastering Chemistry › density 1 Vote Up Vote Down Bailey Brown Staff asked 7 years ago Of the following gases, __________ has density of 2.104 g/L at 303 K and 1.31 atm. A) He B) Ne C) Ar D) Kr E) Xe 1 Answers 1 Vote Up Vote Down Best Answer Selena Tate Staff answered 7 years ago Of the following gases, __________ has density of 2.104 g/L at 303 K and 1.31 atm. Solution: Ar