Hf is a corrosive gas. At 2. 0 atm and 300 k, hf occupies a 4. 50 l volume. How many grams of hf are in the volume?.

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.