20 ml each of oxygen and methane are allowed to react when the reaction is completed.  The system now contains  
A)  10 ml of un reacted O2
B)  10 ml of un reacted CH4
C)  10 ml of steam formed
D)  20 ml of CO2

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.

c. is the answer

by love gaming