KATE! if your out there, please help!
thanks soooooo much!
and how do you give best answer?!
2007-11-04 12:14:57 · 4 answers · asked by maryah_may 1 in Science & Mathematics ➔ Chemistry
Atomic weights: Ca=40 P=31 Ca3P2=182
120gCa/182Ca3P2 x 100% = 66% Ca to two significant figures.
Why do you need Katie? You will discover how to give best answer.
2007-11-04 12:20:45 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋
Ca3P2
The molecular weight of Ca is 40.08
The molecular weight of P is 30.97
So the total weight of Ca is 3 x 40.08 = 120.24
The weight of the whole lot os 3 x 40.8 + 2 x 30.97 = 182.18
So as a percentage the weight of Ca = 100 * (120.24/182.18)
= 66%
2007-11-04 12:22:54 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Ca3P2 =>
Ca : (40.08*3)/182.18 = 65.9%
P : (30.97*2)/182.18 = 34.1%
2007-11-04 12:22:18 · answer #3 · answered by >_> 4 · 0⤊ 0⤋
Ca3P2 =>
Ca : (40.08*3)/182.18 = 65.9%
P : (30.97*2)/182.18 = 34.1%
2007-11-04 12:21:13 · answer #4 · answered by babybear_111 2 · 0⤊ 0⤋