I can't seem to remember how to do this question; can someone help?
I know that AU=196.97 from the chart but I'm at a loss for what I am supposed to do next.
2007-01-14 15:38:48 · 9 answers · asked by Missy 2 in Science & Mathematics ➔ Chemistry
The molecular weight (mass) of gold (AU) is 196.97 grams per mole.
Therefore, the mass is 1.458 moles * 196.97 g/mole = 287.18 grams.
The rule of thumb is to look at the units. The units (the moles) should cancel to "convert" it to the unit that you want (the grams).
Forgetting the numbers for just a moment. The calculation above looks like:
moles * grams divided by moles.
The moles cancel out, leaving you just grams. Sometimes looking at the units helps me remember what to do next.
http://www.lmnoeng.com/molecule.htm
2007-01-14 15:44:11 · answer #1 · answered by Zombies R Us 3 · 0⤊ 1⤋
Heres what you do
I'm sure you've probably done questions like this....but ill try to explain. But this is the work:
mass Au in g= (1.458 mol Au) (196.97g Au/1 mol Au) = 287.18g Au
First you kno the mols of substance A
Then you use the conversion factors.
In this case (196.97g Au/1 mol Au) since 1 mol of anyhting is their amu number replaced by the grams sign.
Then you just solve
btw 196.97g is also kno as the molar mass
to get from moles to grams, multiply by the molar mass
From grams to moles, divide by the molar mass
Hope that helps
2007-01-14 17:06:34 · answer #2 · answered by -Eugenious- 3 · 0⤊ 0⤋
Just follow the steps:
1. Find the molar weight of Gold. It is 196.97. This means that 196.67 grams of gold will contain 1 mole of gold.
2. Find out the grams of gold in 1.458 moles. If 1 mole is 196.67 grams, then 1.458 moles would be 196.67 * 1.458 = grams. This equals to 286.74486 grams of gold.
2007-01-14 15:47:13 · answer #3 · answered by apollo 2 · 2⤊ 0⤋
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2016-05-16 11:16:47 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Multiply the atomic mass by the number of moles:
196.97 grams x 1.458 moles
2007-01-14 15:44:21 · answer #5 · answered by physandchemteach 7 · 0⤊ 0⤋
There must be an blunders there. The molecular weight of ethanol is 40 six; .0.5 mole of EtOH will be 0.230 grams. i imagine someone meant propanol: MW of C3H7OH = 60, 0.0.5 mol * 60 g/mol = 0.three hundred g
2016-10-31 03:15:33 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Just multiply mols by the atomic mass
2007-01-14 16:07:27 · answer #7 · answered by Scott S 4 · 0⤊ 0⤋
That is just about one and one half mols of gold, so you can figure this out.Multiply!
2007-01-14 15:45:30 · answer #8 · answered by Anonymous · 0⤊ 0⤋
1mol=196.97
1.448 ?
1.448 X 196.97= 283.63
2007-01-14 15:44:20 · answer #9 · answered by mitu 2 · 1⤊ 0⤋