2006-11-09 09:16:22 · 4 answers · asked by treupledFK 2 in Science & Mathematics ➔ Chemistry
Use the periodic table of the elements. The "weights" are in grams per mol. Just use algebra and solve for the number of mols. Then you know how many atoms there are by the number of mols which is a definite number.
2006-11-09 09:25:04 · answer #1 · answered by Jack 7 · 0⤊ 0⤋
Have you heard of Avagadro's Constant? (or Avogadro's Number?)
Well, it basically says that there are 6.022*10^23 atoms in every mole of an element.
What you need to do is find out how many moles are in .5g of Na.
the formula for this is n=W/M
where n is the number of moles, W is the weight of the substance you have and M is the Mass Number (usually refered to as "A" in relation to the periodic table)
so the number of moles in .5g Na is:
0.5/23
then multiply the answer for this (moles) by Avogadros number, given above to find the number of atoms.
OK?
2006-11-09 09:42:32 · answer #2 · answered by domhnall_oh 1 · 0⤊ 0⤋
n. (Symbol Na)
A soft, light, extremely malleable silver-white metallic element that reacts explosively with water, is naturally abundant in combined forms, especially in common salt, and is used in the production of a wide variety of industrially important compounds. Atomic number 11; atomic weight 22.99; melting point 97.8°C; boiling point 892°C; specific gravity 0.971; valence 1.
2006-11-09 09:25:20 · answer #3 · answered by oddrofv 2 · 0⤊ 0⤋
.5g x ( 6.022x10^23 / [atomic weight of sodium])
2006-11-09 09:24:11 · answer #4 · answered by Anonymous · 0⤊ 0⤋