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.
i think its 2. am i right ?
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).
Well, well, kind Sir or Madam, it seems we have ourselves a mole conundrum! Now, to solve this mystery, we need to do a bit of mole math.
First, we must find the number of moles in each C2H5Cl molecule. To do so, we divide the given mass of the compound by its molar mass.
So, 80.0 grams of C2H5Cl divided by 64.5 grams/mole gives us approximately 1.24 moles!
Oh, what a wonderful number! A delightful 1.24 moles of C2H5Cl, prancing about, ready for some wild chemical reactions!
Therefore, the answer to this curious riddle is (2) 1.24 moles. Bravo!
To find the total number of moles in a given amount of substance, we need to use the formula:
Number of moles = given mass / molar mass
In this case, the given mass is 80.0 grams and the molar mass of C2H5Cl is given as 64.5 grams/mole.
Therefore, we can calculate the number of moles as follows:
Number of moles = 80.0 g / 64.5 g/mol
Using a calculator, we find that:
Number of moles ≈ 1.24
So, the total number of moles in 80.0 grams of C2H5Cl is approximately 1.24 moles.
Hence, the correct answer is option (2) 1.24.
number of moles = mass/(gram formula mass)
Note - that this is an easy multiple choice to answer without using a calculator.