---1.71 x 10^-3 g of Silver
Silver's Atomic mass=22.99
---280.9 mg of Silicon
Silicon's Atomic mass=28.09
Please explain.
Thanks
2007-03-19 11:10:39 · 6 answers · asked by MGK 1 in Science & Mathematics ➔ Chemistry
Number of moles = Given mass / Mass in 1 mole
Hence no of moles in Silver = 1.71 X 10^-3 / 22.99
And no of moles in Silicon = 280.9 x 10^-3 / 28.09
Work those out and you'll have the number of moles.
2007-03-19 11:16:08 · answer #1 · answered by Anonymous · 0⤊ 0⤋
This is a great way to learn how "units" cancel.
They cancel like common factors in fractions.
Example
moles silver x 1.71E-3 g Silver
-----------------
107.868 g silver
The atomic weight is a ratio that relates the weight of silver with the amount of silver atoms.
The g silver cancel out and you are left with moles of silver.
2007-03-19 18:23:23 · answer #2 · answered by Roy E 4 · 0⤊ 0⤋
1 mol of a substance = RMM in grams
Definition:
http://www.avogadro.co.uk/definitions/avogconst.htm
Therefore
1 mole of Ag is 22.99 g
so
1.71 * 10^-3 / 22.99 = 0.393129 mol Ag
1 mole Si is 28.09 g
0.2809 / 28.09 = 0.01 mol Si
2007-03-19 18:26:38 · answer #3 · answered by Spike J 3 · 1⤊ 0⤋
2x2=4
2007-03-19 18:12:53 · answer #4 · answered by Anonymous · 0⤊ 2⤋
Get a mathmetian.
2007-03-19 18:14:02 · answer #5 · answered by Landon 2 · 0⤊ 2⤋
wowzers.
2007-03-19 18:12:26 · answer #6 · answered by Anonymous · 0⤊ 2⤋