A) 23% increase
B) 12% decrease
C) 12% increase
D) no change
Correct Answer: A
Solution :
\[\underset{\text{Fe }\!\!%\!\!\text{ }\frac{\text{56}}{\text{120}}\text{ }\!\!\times\!\!\text{ 100=46}\text{.67}}{\mathop{\underset{\text{56+32 }\!\!\times\!\!\text{ 2=120}}{\mathop{\text{Fe}{{\text{S}}_{\text{2}}}}}\,}}\,\xrightarrow[{}]{{}}\underset{\frac{112}{\text{160}}\text{ }\!\!\times\!\!\text{ 100}\,\text{=}\,\text{70}}{\mathop{\underset{\text{56}\times \text{2+3 }\!\!\times\!\!\text{ 16}\,\text{=160}}{\mathop{\text{F}{{\text{e}}_{\text{2}}}{{O}_{3}}}}\,}}\,\] Percent increase = 70 - 46.67 = 23% (approx.)
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