Combined Gas Law Practice: A closed gas system initially has a volume and temperature of 1190mL and 334K with the pressure unknown. If the same closed system has values of 768 torrs, 2.3 L, and 394K, what was the initial pressure in the atm?

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils. the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.