Chemical Kineti...

99% of a first order reaction was completed in 32 min. When will 99.9% of the reaction complete ?

For the first order reaction, $$A(g)\rightarrow 2B(g)+C(g)$$, the initial pressure is $$P_A=90$$ mm Hg. Then pressure after 10 minutes is found to be 180 mm Hg. The half-life period of the reaction is:

In a hypothetical reaction, $$A(aq) \rightleftharpoons 2B(aq) + C(aq)$$     (1$$^{st}$$ order decomposition)
'A' is optically active (dextro-rotatory) while 'B' and 'C' are optically inactive but 'B' takes part in a titration reaction (fast reaction) with $$H_2O_2$$. Hence the progress of reaction can be monitored by measuring rotation of plane of polarised light or by measuring volume of $$H_2O_2$$ consumed in titration.

In 20 minutes of 80% of $$N_2O_5$$ is decomposed. Rate constant is:

The inactivation of a viral preparation in a chemical bath is found to be a first-order reaction. The rate constant for the viral inactivation per minute, if in the beginning $$1.5\%$$ of the virus is inactivated, is:

The high temperature $$(\approx 1200 K)$$ decomposition of $$CH_3 COOH (g)$$ occurs as follows, as per simultaneous 1$$^{st}$$ order reactions.
$$CH_3 COOH  \xrightarrow{K_1} CH_4 + CO_2$$
$$CH_3 COOH  \xrightarrow{K_2} CH_2 CO + H_2O$$
What would be the % of CH$$_4$$ by mole in the product mixture (excluding $$CH_3COOH$$)?

For the first order homogeneous gaseous reaction $$A\rightarrow 2B+C$$, the initial pressure was $$P_i$$ while total pressure at time 't' was $$P_t$$. Write expression for the rate constant k in terms of $$P_i, P_t$$ & $$t$$.

Compounds A and B react with a common reagent with first order kinetics in both cases. If 99% of A must react before 1% of B has reacted, what is the minimum ratio for their respective rate constants?

For the following data for the zero order reaction $$A\rightarrow$$ products. Calculate the value of k. 
Time                    [A]
0.0                      0.10 M
1.0                      0.09 M
2.0                      0.08 M

Gaseous reaction $$A \rightarrow B + C$$ follows first-order kinetics concentration of $$A$$ changes from $$1\ M$$ to $$0.25\ M$$ in 138.9 min. Find the rate of reaction when conc. of $$A$$ is $$0.1\ M$$.