The reaction CH3NC ? CH3CN is called an isomerization reaction andinvolves the breaking of a C–N bond and subsequent formation of a C–C bond—the reactant andproduct have the same molecular formulas and so are isomers. This reaction has a rate constant of0.46 s–1 at a specific temperature. What is the concentration of CH3NC after 0.20 min if its initialconcentration is 0.10 M?A. 4.0 × 10–4 M B. 7.6 × 10–6 M C. 8.5 × 10–2 MD. 9.1 × 10–2 M E. 2.5 × 10–2 M

Answer

A

Explanation:

CH3NC --> CH3CN

k = 0.46 s–1

In first order reactions, the reaction rate is directly proportional to the reactant concentration and the units of first order rate constants are 1/sec.

So the reaction is a first order reaction.

t = 0.20 min = 12 s ( Converting to seconds multiply the time value by 60)

initial concentration [A]o = 0.10 M

Final Concentration [A]  = ?

Formular relating these parameters is given as;

Making [A] subject of interest, we have';

ln[A] = ln[A]o − kt

In[A] = In(0.10) - (0.46*12)

In[A] = -7.8226

[A] = e^(-7.8226)

[A] = 0.000401

[A] = 4 * 10^-4M

the answer is either b or c

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: