How is the contamination in baso4 precipitate obtained by reacting ba(no3)2 and na2so4 solutions detected ? ?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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?

What is true of composite volcanoes?