What are the fractions of Fe 2+ and Fe 3+ in Fe 0.93 O respectively?

Question

What are the fractions of Fe 2+ and Fe 3+ in Fe 0.93 O respectively? (A) 0.85,0.15 (B) 0.93,0.07 (C) 0.75,0.25 (D) 0.80,0.20

Tardigrade Admin · Accepted Answer

Let Fe 2+=x Fe 3+=(0.93-x) By charge conservation, +2(x)+3(0.93-x)-2(1)=0 -x+0.79=0 ⇒ x=0.79 Fraction of Fe 2+=(0.79/0.93)=0.85 Fraction of Fe 3+=(1-0.85)=0.15

Q. What are the fractions of $F e^{2 +}$ and $F e^{3 +}$ in $F e_{0.93} O$ respectively?

$0.85, 0.15$

$0.93, 0.07$

$0.75, 0.25$

$0.80, 0.20$

Let $F e^{2 +} = x & F e^{3 +} = (0.93 - x)$
By charge conservation,
$+ 2 (x) + 3 (0.93 - x) - 2 (1) = 0$
$- x + 0.79 = 0 \Rightarrow x = 0.79$
Fraction of $F e^{2 +} = \frac{0.79}{0.93} = 0.85$
Fraction of $F e^{3 +} = (1 - 0.85) = 0.15$

Q. What are the fractions of Fe2+ and Fe3+ in Fe0.93​O respectively?

0.85,0.15

0.93,0.07

0.75,0.25

0.80,0.20