2006-11-13 14:38:12 · 6 answers · asked by reidgocolts 1 in Science & Mathematics ➔ Mathematics
.05/63.546 = .0007868
2006-11-13 14:41:09 · answer #1 · answered by nobody722 3 · 0⤊ 0⤋
thanks for posting a chemistry question on mathematics section but whatever I will answer it:
You must remeber the molar mass of Cu(s) is 63.55 g/mol
try to cancel out the gram so inverse the mol/g so grams cancel out:
As such 0.05g * 1mol/63.55g=7.87*10-4mol Cu(s)
Another trick to remember is the equation:
nM=m where m=mass n=moles M=Molar Mass
Say you have 7.87*10-4molCu, turn into gram so rearrange equation for mass
m=nM=(7.87*10-4mol)(63.55g/mol)=0.05g Cu(s) voila
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one more example so you never have trouble again
Potassium Chloride and Hydrogen Fluoride are reacted to produce products, how many grams of Hydrogen Chloride are produced if there were 21.2 g of Hydrogen
2006-11-13 22:41:15 · answer #2 · answered by Zidane 3 · 0⤊ 0⤋
The molar mass of Cu is 63.5g. If you have only 0.05g then you find the ratio of masses 0.05/63.5. Of course here you'll get a number under 1 because you don't even have a whole mole.
2006-11-13 22:44:29 · answer #3 · answered by kihela 3 · 0⤊ 0⤋
63.546 g/mole
.05g/63.546g/mole=7.8794755421079172970247100353001e-4
7.8794755421079172970247100353001e-4moles*6.023*10^23 molecules per mole=4.7458081190115985879979828542612e20
4.746*10^20 molecules
2006-11-14 00:04:43 · answer #4 · answered by yupchagee 7 · 0⤊ 0⤋
0.5 grams/ (copper's grams per mole look it up in table) = moles
2006-11-13 22:43:41 · answer #5 · answered by Julio Cesar C 2 · 0⤊ 0⤋
.05g/(63.55) g/mol
.05 g mol
----- x ----- = .0078678...mol
1 63.55 g
To the correct number of significant figures the answer is .008 mol.
2006-11-13 22:48:49 · answer #6 · answered by abcde12345 4 · 0⤊ 0⤋