The minimum amount of \( \mathrm{O}_{2}(g) \) consumed per gram of reactant is for the reaction ...

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The minimum amount of \( \mathrm{O}_{2}(g) \) consumed per gram of reactant is for the reaction (Given atomic mass : \( \mathrm{Fe}=56 \), \( \mathrm{O}=16, \mathrm{Mg}=24, \mathrm{P}=31, \mathrm{C}=12, \mathrm{H}=1) \)
(a) \( \mathrm{C}_{3} \mathrm{H}_{8}(g)+5 \mathrm{O}_{2}(g) \longrightarrow 3 \mathrm{CO}_{2}(g)+4 \mathrm{H}_{2} \mathrm{O}(l) \)
(b) \( \mathrm{P}_{4}(s)+5 \mathrm{O}_{2}(g) \longrightarrow \mathrm{P}_{4} \mathrm{O}_{10}(s) \)
(c) \( 4 \mathrm{Fe}(s)+3 \mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}(s) \)
(d) \( 2 \mathrm{Mg}(s)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{MgO}(s) \)
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