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October 26, 2014

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

(1)0.806

(2)1.24

(3)2.48

(4)5.16

i appreciate any help.

- Chemistry -
**Jason**, Monday, January 3, 2011 at 12:30ami think its 2. am i right ?

- Chemistry -
**Dr Russ**, Monday, January 3, 2011 at 12:32amnumber 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 12:38amAgreed.

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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