Hi everybody. I'm currently studying for a chem test and am stuck on this problem:
convert 1.76 X 10 to the negative 3 mol of cesium to grams.
The answer is 2.34 X 10 to the negative 1 grams.....but I can't figure out why.
Thanks so much in advance!
2007-11-05 03:49:07 · 5 answers · asked by Gym♥RAT♥ 3 in Science & Mathematics ➔ Chemistry
the number of moles = mass(g)/Atomic weight
Atomic weight is just a constant, in case of cesium, the atomic weight is approximately 133. This means that 1 mole of cesium weighs 133g.
Therefore:
mass = number of moles * atomic weight
mass = 1.76x10^-3 * 133 = approximately 0.234g, which is equal to what you are supposed to get
2007-11-05 03:55:46 · answer #1 · answered by Anonymous · 1⤊ 0⤋
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2016-05-17 05:05:06 · answer #2 · answered by Carissa 4 · 0⤊ 0⤋
Multiply 1.76E-3 moles of cesium by the molar mass of cesium (grams per mole). Going to the periodic table, we see that Cs has a molar mass of 132.9 g/mole, so 1.76E-3 x 132.9 = 0.234 g.
2007-11-05 03:55:08 · answer #3 · answered by chasm81 4 · 1⤊ 0⤋
Formula: moles = mass / atomic weight
From the periodic table, atomic weight of cesium, Cs = 132.9;
1.76xE-3 = mass / 132.9
Mass = (1.76xE-3) x 132.9
= 0.2339
= 0.234 (3 decimal places)
0.234 is also equals to 2.34xE-1
2007-11-05 04:03:36 · answer #4 · answered by Nicholas C 1 · 0⤊ 0⤋
1.76*10-^3 * 133 = 2.34*10-^1.
133 gmol-1 = atomic weight Cs.
2007-11-05 04:04:10 · answer #5 · answered by BB 7 · 0⤊ 0⤋