Posted by Jason on Monday, January 3, 2011 at 12:28am.
i think its 2. am i right ?
number of moles = mass/(gram formula mass)
Note - that this is an easy multiple choice to answer without using a calculator.
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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