How many atoms of potassium are in 249 g of potassium sulfate?

1 Answer
anor277
Aug 14, 2017

Approx. #1.7xx10^24# individual potassium cations.....

Explanation:

We work out (i) the molar quantity of potassium sulfate:

#(249*g)/(174.26*g*mol^-1)=1.43*mol#.

Stoichiometry INSISTS that if there are #1.43*mol# potassium sulfate, there are #2xx1.43*mol=2.86*mol# with respect to potassium ion.

And thus we multiply this molar quantity by #N_A,# #"the Avocado number"#....

#"No. of potassium cations"=2.86*molxx6.022xx10^23*mol^-1=??#

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