A first order reaction has a specific reaction rate of 10–2sec–1. How much time will it take for 20g of the reactant to reduce to 5g ?
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The units of a reaction rate are concentration / time. This is most often M / s, where M is molarity (moles per liter) and s is time in seconds.
P.S. Don’t get M / s (molarity per second) confused with m / s (meters per second)
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Answer:138.6 second
Explanation:
K= 10^-2 per second.
R°= 20
R= 5
For first order reaction,
time= 2.303/k log[R°]/[R]
T= 2.303/10^-2 log 20/5
Time= 138.6 seconds.
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