Can you solve below mathematical equation?

2^1234 - 2^1233

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

What is the largest number you can write with just 3 digits?

Can you find the six hidden animals in the picture below?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

Do You See It?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you find the missing piece of the Porsche?

Can you replace the question mark with the correct number in the below table sequence?