Question #3ff32

1 Answer
May 12, 2017

Answer:

#"Option ..........B"#

Explanation:

We simply need to find the molar quantity of sulfuric acid.........and multiply this molar quantity by Avogadro's number.............and then perform the subtraction.

#"Moles of stuff"="Mass of stuff"/"Molar mass of stuff"#

And here #"Moles of sulfuric acid"=(98xx10^-3*g)/(98.08*g*mol^-1)#

And so number of sulfuric acid molecules...........

#=N_Axx(98xx10^-3*g)/(98.08*g*mol^-1)#

#=6.022xx10^23*mol^-1xx(98xx10^-3*g)/(98.08*g*mol^-1)=6.0xx10^20# #"molecules"#. And if we take #3xx10^20# molecules away from this quantity we are left with #3xx10^20# such molecules.

And this represents a molar quantity of #(3xx10^20*"molecules")/(6.022xx10^23*"molecules"*mol^-1)=5xx10^-4*mol#.

Not a good question, in that they are simply asking you how to use a calculator. This is non-trivial but also non-chemistry.