Calculate the mass of nitrogen dissolved at room temperature in an 89.0 LL home aquarium. Assume a total pressure of 1.0 atmatm and a mole fraction for nitrogen of 0.78.

Answer : The mass of nitrogen dissolved is, 79.4 grams

Explanation :

The Raoult's law for liquid phase is:

where,

= partial vapor pressure of nitrogen = ?

= total pressure = 1.0 atm

= mole fraction of nitrogen = 0.78

Now put all the given values in the above formula, we get:

Now we have to calculate the mass of nitrogen.

Using ideal gas equation:

where,

P = pressure of gas = 0.78 atm

V = volume of gas = 89.0 L

T = temperature of gas =

R = gas constant = 0.0821 L.atm/mole.K

w = mass of gas = ?

M = molar mass of nitrogen gas = 28 g/mole

Now put all the given values in the ideal gas equation, we get:

Therefore, the mass of nitrogen dissolved is, 79.4 grams

b) mutualism

hope this : )

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e