Asked by Jason
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.
(1)0.806
(2)1.24
(3)2.48
(4)5.16
i appreciate any help.
Answers
Answered by
Jason
i think its 2. am i right ?
Answered by
Dr Russ
number of moles = mass/(gram formula mass)
Note - that this is an easy multiple choice to answer without using a calculator.
Note - that this is an easy multiple choice to answer without using a calculator.
Answered by
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).
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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