An experimental drug, D, is known to decompose in the blood stream. Tripling the concentration of the drug increases the decomposition rate by a factor of nine. Write the rate law for decomposition of D and give the units of the rate constant in terms of seconds.

The rate law of the decomposition reaction is :

The unit of the rate constant  will be

Explanation:

The rate law can be written as';

..[1]

On tripling concentration of the drug increases the decomposition rate by a factor of nine.

...[2]

[1] ÷ [2]

On solving for x , we get;

x = 2

Second order reaction

The rate law of the decomposition reaction is :

unit rate constant will be :

The unit of the rate constant  will be

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.