A balloon containing a sample of helium gas is warmed in an oven at constant pressure. If the balloon measures 1.25 L at room temperature (20.0°C), what is its volume at 82.0°C?
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L

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

Answerstudying coal cumbustion as an energy source;

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