If two gases are present in a container, the total pressure in the container is equivalent to the sum of the pressure that are exerted by each of the two gases. twice the sum of the pressure that are exerted by the individual gases. the sum of the pressure that each gas would exert if they occupied twice the volume. the sum of the pressure that each gas would exert if they occupied half the volume

The correct option is A.
If two gases are present in a container, the total pressure that the two gases will exert on the container will be the sum of the pressure exerted by each of the two gases. For instance, if gas A and gas B are present in a container and gas A exerts a pressure of 10 atm and gas B exerts a pressure of 35 atm, then, the total pressure exerted on the container is 10 + 35 = 45 atm. This is because, the particles of both gases are colliding with the wall of the container simultaneously.

Adialysis unit requires 78.5 l of water.the estimated digit is 5.