The reaction below shows the reaction of magnesium reacting with excess oxygen gas to produce magnesium oxide. Assume that 5.63 g of Mg reacts with excess oxygen to produce 8.38 g of Mgo.
2Mg + 0, → 2MgO
What is the approximate percent yield for this reaction?

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.