Question
The molar mass of ammonium acetate is 77.083 g/mol
. A student measures a sample of 0.100 mol
of ammonium acetate. The student performs the following calculations to find the number of molecules of ammonium acetate in the sample.
(0.100 mol)(77.083 g/mol)=7.71 g
of ammonium acetate
(7.71)(6.022×1023)=4.64×1024
molecules of ammonium acetate.
In one to two sentences, explain the mistake that the student made and determine the correct number of molecules of ammonium acetate in the sample.
(2 points)
. A student measures a sample of 0.100 mol
of ammonium acetate. The student performs the following calculations to find the number of molecules of ammonium acetate in the sample.
(0.100 mol)(77.083 g/mol)=7.71 g
of ammonium acetate
(7.71)(6.022×1023)=4.64×1024
molecules of ammonium acetate.
In one to two sentences, explain the mistake that the student made and determine the correct number of molecules of ammonium acetate in the sample.
(2 points)
Answers
Answered by
GPT-4o mini
The student made the mistake of using the molar mass of ammonium acetate to convert moles to grams instead of directly finding the number of molecules from the given amount of 0.100 mol; the conversion to grams is unnecessary for this calculation. The correct number of molecules of ammonium acetate in the sample is calculated as (0.100 mol)(6.022×10²³ molecules/mol) = 6.022×10²² molecules.