What mass of #BF_3# contains the same number of molecules as a #0.53*g# mass of water?

1 Answer
Sep 10, 2017

Answer:

And so you want the MASS of #BF_3# that corresponds to the same number of molecules in a #0.53*g# mass of water?

Explanation:

#"Moles of water"-=(0.53*g)/(18.01*g*mol^-1)=0.0294*mol#...

Now the mole is simply a number, i.e. #1*mol# specifies #6.022xx10^23# individual molecules of whatever stuff you got.

ANd so we multiply this molar quantity by the molar mass of #BF_3#....

#-= 0.0294*molxx67.82*g*mol^-1=2.0*g#.........