What is the identity of a sample that has a volume of 0.56 cm3 and a mass of 10.8 g?

In 2002, the rare earth elements mine in mountain pass, california was closed because

How does the viscosity of magma change as magma cools?

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?