If 0.251moles of H2O gas are produced, how many liters of oxygen gas was used?
___H2(g) + ___O2(g) ___H2O(g)

(use equation above) If 5.50liters of hydrogen is used to make water, how many grams of oxygen should be used also?

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

In which situation can a mixture always be called a solution

How might this scientific phenomena be explained? a paper clip floats on water.