A drug becomes ineffective after `30%` decompoistion. The original concentration of a sample was `5 mg mL^(-1)` which becomes `4.2 mg mL^(-1)` during `20` months. Assuming the decompoistion of first order, calculate the expiry time of the drug in month. What is the half life of the Product?

A drug becomes ineffective after 30% decomposition. The original concentration of a sample was 5 mg/mL , which becomes 4.2 mg/mL during 20 months. Assuming the decomposition of first order, calculate the expiry time of the drug in months.

A drug becomes ineffective after 30 % decomposition. The original concentration was 10 mg mL ""^(-1) which becomes 8.4 mg mL ""^(-1) during first 40 months. Assuming the decomposition of first order, calculate the expiry time of the drug in months. What is the half-life of the drug?

a) What will be the initial rate of reaction if rate constant is 10^(-3)s^(-1) at concentration of 0.2 mol L^(-1) ? How much of the reactant will be converted into product in 200 minutes? Assume reaction to be of first order. b) The half life of 1st order reaction A to B is 600s. What percentage of A remains after 30 minutes?

Consider reaction in which reactant R is converted into product P : RtoP . When the initial concentration of R^(') is 0.5M The half life of the reaction is 20 minute. When the initial concentration is increased to 1.3 M, the half life decreases to 7.69 minute. Q. What is the order of the reaction?

The rate constant for a first order reaction is 7.5 xx 10^(-4) s^(-1) . If initial concentration of reactant is 0.080 M , what is the half life of reaction ?

A first order reaction has k=1.5xx10^-6 s^-1 at 200^@C . If the reaction is allowed to run for 10 hours, what percentage of the initial concentration would have changed into the product ? What is the half life period of the reaction ?

For a first order reaction A to B the reaction rate at reactant concentration of 0.01 M is found to be 2.0 xx 10 ^-5mol L^(-1) s^(-1) . The half-life period of the reaction is

100 ml of a sample of water requires 1.96 mg of potassium dichromate in the presence of 50% H_2SO_4 for the oxidation of dissolved organic matter in it. Calculate the chemical oxygen demand.