Ln(800/3200) = - kt
t = 24 years.
ln(0.25) = -k*24
(- 1.3863) = -k*24
1.3863 / 24 = k
0.05776 = k
ln(0.5) = -k*t
-0.6931 = - 0.05776 t
12 = t
I don't know if you can just look at the question and know the answer. If 24 years is a quarter life then is it obvious that the 1/2 life is 12 years? It might be, but the method I've used works for sure.
Answer:
2 HCl
Explanation:
Please kindly check attachment for the step by step solution of the given problem.
Answer:
Caustic soda
Explanation:
The fractional distillation of air is carried out on liquid air. Before air is liquified, the carbon dioxide content of air is removed using caustic soda. The air is then compressed to a pressure of about 200 atm, sudden expansion of the gas leads to cooling. The process continues until air becomes liquid at -200°C.
Fractional distillation of liquid air usually produces nitrogen and oxygen as major products. nitrogen in obtained first since it has a lower boiling point than oxygen. The gases are then dried, compressed and stored in cylinders.
Explanation:
Collision theory helps in determining the rate of a reaction as it states that for a reaction to occur it is necessary that there will be number of collisions between reactant molecules.
Therefore, when powdered sugar is placed into water then due to more surface area there will be more number of collisions between sugar and water molecules. As a result, sugar will readily dissolve in water.
On the other hand, surface area of cube will be less as compared to powdered sugar. Hence, there will be less number of collision and cube will take time to dissolve in water.
Ln(P2/P1) = (L/R).(1/T1 - 1/T2)
<span>with P1 = 1 atm, P2 = 45.9 atm, R = 8.314 J/mol.K, T1 = 452.15 K, T2 = 695.15 K. This gave the latent heat L as 41.2 kJ/mol.K. </span>
<span>Using this value, and calculating the vapour pressure at 120°C = 393.15 K </span>
<span>ln(P2) = (41.2 x 10^3/8.314).(1/452.15 - 1/393.15) </span>
<span>which gives the vapour pressure P2 as 0.1931 atm = 146.7 torr. </span>
