convert from mols to grams?

Question

any help with this is life saving please explain the answer I don't want just the answer how does this conversion work??? THANKS IN ADVANCE FOR YOUR HELP!!!!!!!!!!!!!!!!!!!!

A. 1.76x10^-3 mol of Cesium
B. 0.0125 mol of Neon
C. 5.29 x10^3 mol of Lead
D. 0.00000122 mol of Sodium
E. 5.51 millimol of Arsenic
F. 8.72 mol of Carbon

Answer 1

You obtain the number of grams per mole from the periodic table.

A. 1.76x10^-3 mol of Cesium * (132.90545 g Cs / 1 mol Cs) = 0.234 g Cs

B. 0.0125 mol of Neon * (20.1797 g Ne / 1 mol Ne) = 0.252 g Ne

C. 5.29 x10^3 mol of Lead * (207.2 g Pb / 1 mol Pb) = 1.10*10^6 g Pb

D. 0.00000122 mol of Sodium * (22.989770 g Na / 1 mol Na)= 2.80*10^-5

E. 5.51 millimol of Arsenic
First we need to convert millimoles to moles. We know there are 1000 moles in a millimole. So...
5.51 millmoles * (1 mole / 1000 millimoles) = 0.00551 moles

Now we can calculate grams of arsenic:

0.00551 moles As * (74.92160 g As / 1 mol As) = 0.413 g As

F. 8.72 mol of Carbon
8.72 mol C * (12.0107 g C / 1 mol C) = 105 g C

Don't forget to include significant figures on all calculations! Hope this helps!

Answer 2

Use the following formula,

n = m / M

n = moles
m = mass (g)
M = molar mass (g mol^-1)

thus,

A. m = n x M
m = 1.76x10^-3 mol x 132.905 g mol^-1
m = 0.234 g (3 s.f.)

B. m = n x M
m = 0.0125 mol x 20.1797 g mol^-1
m = 0.252 g (3 s.f.)

C. m = n x M
m = 5.29 x10^3 mol x 207.2 g mol^-1
m = 1.096 x 10^6 g (4 s.f.)

D. m = n x M
m = 0.00000122 mol x 22.99 g mol^-1
m = 2.80 x 10^-5 g (3 s.f.)

E. 1 mol = 1 x 10^-3 mmol

m = n x M
m = (5.51/ 1 x 10^-3)mol x 74.9 g mol^-1
m = 4.127 x 10^5 g (4 s.f.)

F. m = n x M
m = 8.72 mol x 12 g mol^-1
m = 1.04 x 10^2 g (3 s.f.)

hope this helps :-)

Answer 3

A) 1.76x10^-3 mol of Cs. formula weight for Cs is 132.91grams/mol you set up problem to where moles cancel and end up with just grams. in this case multiply the two numbers together.



the rest are similar except E you have to convert millmol to mol so just divide by thousand. cause 1mol is = to 1000millimol

Answer 4

i ought to do all of those for you, or i ought to describe the technique, so which you're able to do it your self next time. you would be wanting a periodic table. For the 1st one, look up the atomic mass of iron (Fe). The mass is the long quantity below the emblem. Fe's is fifty 5.845. situations that by way of 2, using fact the subscript is two, and that's what number you have. you may get 111.sixty 9. Set that quantity aside. Now take the mass of oxygen (O). this is 15.9994. situations that by way of 3, considering the fact which you have 3 as a subscript. you may get 40 seven.9982. Now take the mass of your irons (111.sixty 9) and the mass of your oxygens (40 seven.99982) and upload them jointly. that ought to furnish you 159.6882. So take 4.seventy seven and divide it by way of 159.6882. and you get 0.0298707. you will ought to around it off to .030, using fact of serious figures. I reccomend googling the regulations for those in case you % them. wish this facilitates!

Answer 5

to convert from mole to gram you need the atomic mass
the atomic mass is actually mol/gram and it's different for every element
maybe this can help you:
mole / (mol/gram) = gram

(mol/gram)---> atomic mass
the mole is the numbers you have now, you use it to divide by the atomic mass you get from the table to elements for each element to get the total gram

hope that helped

Answer 6

You always want to find the molar mass, and multiply the moles by that.


A. Move the decimal three places to the left, and multiply it by 132g Cs / 1 mole Cs

B. .0125 moles Ne * 20g Ne/1 mole Ne

C. Move decimal 3 places to the right, multiply by 207

D. multiply by 23

e. I dont know what millimol is

f. multiply by 12

Answer 7

Take moles and multiply by the atomic weight to get the mass in grams.