a 1.56 gram sample of copper reacts with oxygen to form 1.95g of the metal. what is the empirical formula of the metal oxide?

One similarity and one difference between an element and a mixture of elements

What is the percent by mass of magnesium sulfate in mgso4.7h2o

In the haber reaction, patented by german chemist fritz haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. this reaction is now the first step taken to make most of the world's fertilizer. suppose a chemical engineer studying a new catalyst for the haber reaction finds that 671 liters per second of dinitrogen are consumed when the reaction is run at 271c and 0.99atm. calculate the rate at which ammonia is being produced. give your answer in kilograms per second. round your answer to significant digits.