Posted by Jason on .
what is the total number of moles in 80.0 grams of C2H5Cl (gramformula mass=64.5grams/mole)?
(1)0.806
(2)1.24
(3)2.48
(4)5.16
i appreciate any help.

Chemistry 
Jason,
i think its 2. am i right ?

Chemistry 
Dr Russ,
number of moles = mass/(gram formula mass)
Note  that this is an easy multiple choice to answer without using a calculator. 
Chemistry 
Dr Russ,
Agreed.
number of moles = mass/(gram formula mass)
=80 g/64.5 g mole^1
without using a calculator, 80/64.5 must be greater than 1.0 (so not answer 1)) as numerator (80) is greater than denominator (64.5).
Similarly as the numerator (80) is less than twice denominator (64.5) the answer can't be 3) or 4) and must be 2).