Posted by Jason on Monday, January 3, 2011 at 12:28am.
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, Monday, January 3, 2011 at 12:30am
i think its 2. am i right ?

Chemistry  Dr Russ, Monday, January 3, 2011 at 12:32am
number of moles = mass/(gram formula mass)
Note  that this is an easy multiple choice to answer without using a calculator.

Chemistry  Dr Russ, Monday, January 3, 2011 at 12:38am
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).
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