1.

A first order reaction has a rate constant 1.15 xx 10^(-3)s^(-1). How long will 5g of this reacant take to reduce to 3g ?

Answer»

SOLUTION :Data, `[R]_(0)(5)/(M)' [R] (3)/(M)` M is molar MASS of the REACTANT
` k = 1.15 xx 10^(-3)s^(-1)`
Formula: `k = (2.303)/(t) log ""([R]_(0))/([R])"" `t = (2.303)/(1.15 xx 10^(-3)) log ""((5)/(M))/((3)/(M))`
` t = (2.303)/(1.15 xx 10^(-3)) xx 0.2218 "" t 444 s.`


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