聽日考化學啦,有啲o野仲未明.HELP!

首先
calcium bromide 係 ionic compound
唔係 molecule
由於佢係 ionic compound
佢有 ions, 但係冇 atoms
咁係因為佢 d atoms lose 或者 gain 左 electrons 變成 ions
calcium bromide 既 symbol 係 CaBr2 (→ Ca2+ + 2Br-)
jie 係 1 mole calcium bromide 有 1 mole Ca2+ 同 2 mole Br-
y mole 就會有 y mole Ca2+ 同 2y mole Br-
如果你明, 就講講 d 答案

for A) 同 D)
頭先講過, CaBr2 冇 molecules 同 atoms, 所以錯
for B) 同 C)
頭先都講過, 1 moles calcium bromide 有 1 mole Ca2+ 同 2 mole Br-
Ca2+ 係 cation, Br- 係 anion
所以 1 moles calcium bromide 有 1 mole cation 同 2 mole anions
答案係 C

Calcium bromide is CaBr2 and it is an ionic compound consists of

One Ca2+ Cation , and Two Br 2- anion

So One mole of calcium bromide contains

A. Wrong => Ionic compound, not molecule
B. Wrong => Should be one mole of cation
C. Correct
D. Wrong => 3 moles of ions, not atoms.

answer is C
because calcium bromide CaBr2> 2moles Br- anions

Not A:
calcium bromide is in giant ionic structure, molecules doesn't exist!
(each ion is bonded by ionic bond)

Not D:
should be: 3 moles of ions

因為係三個ions , 唔係三個atom 。
佢係ionic compound,
composed of 2moles of anions and 1 mole of cation