Does anyone know the answer to this question...It would help me tons..thanks
2007-02-07 11:14:57 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Atomic weights: Ca = 40 S = 32 O = 16 H = 1 CaSO4*2H2O = 156 2H2O = 36
36/156 x 100% = 23%
2007-02-07 11:20:25 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋
Do a % composition-type of calculation.
Add the total mass of the compound-water combination.
Ca = 40
S = 32
O4 = 64
2 H2 = 4
2 O = 32
mass = 172
Add the mass of water
2 H2 = 4
2 O = 32
mass = 36
divide the mass of water by the mass of whole compound then multiply by 100
(36 / 172) x 100
2007-02-07 19:17:03 · answer #2 · answered by physandchemteach 7 · 0⤊ 0⤋
ok take the molar mass of water and divide it by the molar mass of the whole molecule
2007-02-07 19:18:19 · answer #3 · answered by MS32291 4 · 0⤊ 0⤋