How many atoms are in 2.4 grams of Strontium
I have the answer I just dont know how to do the problem, please show work and I will give you the pts.
2007-09-14 01:02:06 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
find the mass of 1 mole of strontium (change the relative atomic mass into grams).
actual mass divided by mass of 1 mole = actual number of moles.
number of moles * Avogadro's number = number of atoms.
Avogadro's number is 6.02*10(superscript23)
I can't remember the molar mass of strontium. I have flu so I am too ill to look it up.
2007-09-14 01:08:14 · answer #1 · answered by Lindsay 3 · 0⤊ 0⤋
Divide the mass by the molar mass of strontium. That will give you moles of strontium in 2.4 grams. Then, multiply that by Avogadro's number (6.02 X 20^23) and you're done.
2007-09-14 08:32:18 · answer #2 · answered by hcbiochem 7 · 0⤊ 0⤋
Strontium wieghs 87.62 g per mole. 2.4g / 87.62g/mole to get moles of .027 moles multiply that by 6.02*10(23rd power) and there are 1.6*10(22nd power). Don't forget sig dig.
2007-09-14 09:31:25 · answer #3 · answered by jmrdelorean 4 · 0⤊ 0⤋