Posted by **Jason** on Monday, January 3, 2011 at 12:28am.

what is the total number of moles in 80.0 grams of C2H5Cl (gram-formula 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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