A student is given a cube of metal that is known to have a mass of 125.0 grams. She measures the mass of the metal four different times with the following results: 125.1 g, 124.8 g, 125.3 g and 124.2. Calculate the percent error of the student.

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?