A drug becomes ineffective after 30 % decomposition. The original concentration of a sample was 5mg/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. What is the half life of the product?

 

Related Questions:

What is Arrhenius equation ?

what happen when activation energy of a chemical reaction becomes equal to RT?

What is the activation energy and how to different from threshold energy ?

In Arrhenius equation for a certain reaction, the value of A and Ea (activation energy) are 4 × 10^13 sec–1 and 98.6 kJ mol–1 respectively. At what temperature, the reaction will have specific rate constant 1.1 × 10^–3 sec–1?

The energy of activation for a reaction is 100 kJ mol–1. Presence of a catalyst lowers the energy of activation by 75%.What will be effect on rate of reaction at 20ºC, other things being equal?

 

 

 

 

 

Mole concept and Stiochiometry:

 (1) SOME BASIC CONCEPT OF CHEMISTRY:
(1) BASIC TOPICS :
1.1.1 DALTON'S ATOMIC THEORY:
1.1.2 ATOMIC MASS AND MOLECULAR MASS:
1.1.3 PERCENTAGE COMPOSITION OF COMPOUNDS:
1.1.4 DETERMINATION OF EMPIRICAL AND MF:
(2) Mole concept and Stiochiometry
2.1.1 MOLE-MOLE ANALYSIS
2.1.2 CONCEPT OF LIMITING REAGENTS
2.1.3 PRINCIPLE OF ATOM CONSERVATION (PAOC)
2.1.4 GRAVIMETRY-WEIGHT WEIGHT ANALYSIS
2.1.5 EUDIOMETRY-VOLUME VOLUME ANALYSIS OF GAS
2.1.6 DEGREE OF HARDNESS OF HARD WATER
2.1.7 OLEUM AND ITS PERCENTAGE(%) LABBELING
2.1.8 VOLUME STRENGTH OF H2O2(aq)
2.1.9 PERCENTAGE (%) AVAILABLE CHLORINE IN BLEACHING POWDER
2.1.10 PERCENTAGE YIELD OF CHEMICAL REACTION:
2.1.11 PERCENTAGE PURITY OF GIVEN SAMPLE:
(3) law of chemical combinations:
3.12 (1) Law of conservation of mass: 

3.12 (2) Law of constant composition 

3.12 (3) Law of multiple proportion:

3.12 (4) Law of reciprocal proportion:

 

3.12 (5) Gay Lussac’s law of Combining Volumes:

 Related Questions:

(1):Calculate the mole fraction of solute in the 12 molal aqueous solution of CaCO3.

(2):The mole fraction of glucose in aqueous solution is 0.2 , The molality of solution will be.

(3):If the mole fraction of a solute is changed from 1/4 to 1/2 in the 800 gm of solvent . then the ratio of molality will be .

(4):Mole fraction of I2 (iodine) in benzene (C6H6) is 0.2 . Calculate the molality of iodine (I2) in benzene.

(5):Calculate the amount of water that should be added to 16 gm methanol to make mole fraction of methanol as 0.25.?

(6) What is relation between mole fraction and molality of solute ?