Using the law of conservation of matter, determine the number of grams of iron sulfide (fes) that will be produced in this reaction. 112g fe + 64g s → g fes a) 48 grams b) 64 grams c) 112 grams d) 176 grams

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

If you reacted 450 g of trimethylgallium with 300 g of arsine, what mass of gaas could you make?

How many grams of oxygen gas will react completely with a block of calcium metal that is 3.0 cm by 3.5 cm by 4.2 cm, if the density of calcium is 1.55 g/ml? show all steps of your calculation as well as the final answer.