# Calculate the percent composition of lithium in “Li”_3″PO”_4?

##”% Li” = 17.983%##

A compound’s essentially tells you how many grams of each constituent element you get per ##”100 g”## of compound.

##color(blue)(|bar(ul(color(white)(a/a)”% element” = “mass of said element”https://studydaddy.com/”mass of the compound” xx 100color(white)(a/a)|)))##

This means that in order to find the of lithium phosphate, ##”Li”_3″PO”_4##, you need to know how many grams of each constituent element you get in a sample of the compound.

Now, notice that one mole of lithium phosphate contains

• three moles of lithium, ##3 xx “Li”##
• one mole of phosphorus, ##1 xx “P”##
• four moles of oxygen, ##4 xx “O”##

The first thing to do here is use the molar mass of each element to find the molar mass of the compound. This will then allow you to calculate the percent composition of lithium by using the mass of lithium that corresponds to one mole of lithium phosphate.

So, the molar masses of lithium, phosphorus, and oxygen are

##”For Li: ” M_M = “6.941 g mol”^(-1)##

##”For P: ” M_M = “30.9738 g mol”^(-1)##

##”For O: ” M_M = “15.9994 g mol”^(-1)##

The molar mass of lithium phosphate will thus be

##overbrace(3 xx “6.941 g mol”^(-1))^(color(blue)(“three atoms of Li”)) + overbrace(1 xx “30.9738 g mol”^(-1))^(color(purple)(“one atom of P”)) + overbrace(4 xx “15.9994 g mol”^(-1))^(color(red)(“four atoms of O”))##

##M_M = “115.794 g mol”^(-1)##

This means that one mole of lithium phosphate will have a mass of ##”115.794 g”##. But you also know that one mole of lithium has a mass of ##”6.941 g”##, and that you get three moles of lithium per mole of lithium phosphate.

You can thus say that

##”% Li” = (3 xx 6.941 color(red)(cancel(color(black)(“g mol”^(-1)))))/(115.794color(red)(cancel(color(black)(“g mol”^(-1))))) xx 100 = color(green)(|bar(ul(color(white)(a/a)”17.983%”color(white)(a/a)|)))##

Therefore, you will get ##”17.983 g”## of lithium for every ##”100 g”## of lithium phosphate.

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

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.

### Money-back guarantee

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.

### Zero-plagiarism guarantee

Each 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.

### Free-revision policy

Thanks 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.