Answer the following questions about bec2 h2o(s) → bec2o4 (s) + 3 h2o(g) if 3.21 g of bec2 anhydrous beryllium oxalate is leftover? o4 (s) and its hydrate. (a) calculate the mass percent of carbon in the hydrated form of the solid that has the formula bec2 heated to 220.°c, bec2 o4 • 3 h2o(s) dehydrates completely as represented below. bec2 o4 • 3 h2o(s) is heated to 220 c, how much o4 • 3h2o (b) when o4 •