I want to thank your team (Jeff) for finding a new writer when you were unable to reach my existing writer to revise my paper. I appreciate your professionalism and efforts. Thanks
Report (any type)/Brief report
22/09/2021
It depends on the substance whose volume you know.
If you have a pure liquid or a solid, you use its to calculate its mass and then divide the mass by the molar mass.
If you have a solution, you multiply the by the volume in litres.
MOLES FROM VOLUME OF PURE LIQUID OR SOLID
There are two steps:
Example
How many moles are in 10.00 mL of acetic anhydride? The molar mass of acetic anhydride is 102.1 g/mol and its density is 1.080 g/mL?
Solution
The formula for density is
##color(blue)(|bar(ul(color(white)(a/a) ρ = m/V color(white)(a/a)|)))” “##
where ##ρ## is the density, ##m## is the mass, and ##V## is the volume of the sample.
We can rearrange the formula to get
##m = V × ρ##
##”mass” = 10.00 color(red)(cancel(color(black)(“mL”))) × “1.080 g”/(1 color(red)(cancel(color(black)(“mL”)))) = “10.80 g”##
##n = 10.80 color(red)(cancel(color(black)(“g”))) × “1 mol”/(102.1color(red)(cancel(color(black)(“g”)))) = “0.1058 mol”##
MOLES FROM VOLUME OF SOLUTION
Molarity is the number of moles of a substance in one litre of solution.
##color(blue)(|bar(ul(color(white)(a/a) M = n/Vcolor(white)(a/a)|)))” “##
where ##n## is the number of moles and ##V## is the volume in litres.
We can rearrange this equation to get the number of moles:
##n = M × V##
Example
How many moles of ##”NaCl”## are contained in 0.300 L of 0.400 mol/L ##”NaCl”## solution?
Solution
##n = 0.300 color(red)(cancel(color(black)(“L soln”))) × “0.400 mol NaCl”/(1 color(red)(cancel(color(black)(“L soln”)))) = “0.120 mol NaCl”##
Show more
I want to thank your team (Jeff) for finding a new writer when you were unable to reach my existing writer to revise my paper. I appreciate your professionalism and efforts. Thanks
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Read moreEach paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Read moreThanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.
Read moreYour email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
Read moreBy sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
Read more