During an effusion experiment, a certain number of moles of an unknown gas passed through a tiny hole in 50 seconds. Under the same conditions, the same number of moles of oxygen gas passes through the hole in 30 seconds. What is the molar mass of the unknown gas?

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

The identities of substances are the same before and after which type of change

Calcium carbonate decomposes at high temperatures to give calcium oxide and carbon dioxide as shown below. caco3(s) cao(s) + co2(g) the kp for this reaction is 1.16 at 800°c. a 5.00 l vessel containing 10.0 g of caco3(s) was evacuated to remove the air, sealed, and then heated to 800°c. ignoring the volume occupied by the solid, what will be the mass of the solid in the vessel once equilibrium is reached?