In a reaction, you combined 30 g of oxygen gas and an excess of hydrogen gas. They reacted to produce 29.7 g of water, according to the following reaction:
H2(g) + O2(8) ---> H2O(1)
a. What is the actual yield of H2O? 29.78
b. How many grams of water should you have been able to produce? (theoretical yield) ( Select ]
c. What is the percent yield? (Select]

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.

i have no clue hope you find the answer

fe 55.85 g/mol and h2o 18.02 g/mol.