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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Sunday, June 12, 2011

Half-Life Time

The meaning of Half-Life time is easy: Time needed to make a chemical substance becomes half-part of it on a reaction.

To determine the equation of half-life time, we have to use the integrated equation of rate of reaction and of course the coefficient and the order of reaction of substances.

For example, Determine the half-life time equation for first order of reaction for this reaction: aA(g) --> B(g)

From my previous post about Integrated Equation of Rate of Reaction, we already found the equation for first order reaction.

Okay, now we’ve found the one we were searching for. Now, I will give you the formula of half-life time reaction for the order of reaction of 'n' with 'n' is not equal to 1.

Example of Question:

Determine the half-life time of the reaction of: 2 N2O5(g) --> 4 NO2(g) + O2(g) at 45oC if the rate of reaction constant of it is 3,115 x 10-4 s-1 and the order of reaction of that reaction is one! (Answer: 1112,6 s)

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