### Self-test E.5A

Posted:

**Tue Oct 08, 2019 5:11 pm**The question goes as follows:

Calculate the amount of urea molecules, OC(NH2)2 , in 2.3 x 10^5 g of urea.

The answer it gives is 3.8 x 10^3 moles, which is correct but I thought the question was asking for the amount of individual molecules of OC(NH2)2. Which should be (3.8 x 10^3) x (6.0221 x 10^23)= 2.3 x 10^27 molecules of OC(NH2)2.

Am I missing something? or does "amount of urea molecules" actually mean moles?

Calculate the amount of urea molecules, OC(NH2)2 , in 2.3 x 10^5 g of urea.

The answer it gives is 3.8 x 10^3 moles, which is correct but I thought the question was asking for the amount of individual molecules of OC(NH2)2. Which should be (3.8 x 10^3) x (6.0221 x 10^23)= 2.3 x 10^27 molecules of OC(NH2)2.

Am I missing something? or does "amount of urea molecules" actually mean moles?