Aheat flux meter attached to the inner surface of a 3-cm-thick refrigerator door indicates a heat flux of 25 w/m² through the door. also, the temperatures of the inner and the outer surfaces of the door are measured to be 7°c and 15°c, respectively. determine the average thermal conductivity of the refrigerator door. 0.0938 w/m. c

Rethink and reinvent

Ithink a i think i tried i hope that : )

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