Help!!! Consider the following reaction: 4Al(s) + 3O2(g) → 2Al2O3(s) It takes 4.05 L of pure oxygen gas at STP to react completely with a certain sample of aluminum. What mass of aluminum reacted?
6.50 g
3.21 g
9.23 g
5.22 g
6.02 g

Reaction involved in present system is :   c12h22o11 + h2o → 2 c6h12o6the reaction system is obeying following rate law:   rate = k[c12h22o11]thus, it is a first order reaction.now, for 1st order reactionrate constant (k) =  given: initial conc. = 3.0 g, final conc. = 2.7 g, t = 2.5 h∴rate constant (k) =  ∴ k = 0.04215 h-1now, for 1st order reaction, half life = 0.693/k = 0.693/0.04215 = 16.4 hthus correct answer is option b

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