A sample of argon gas is at a pressure of 122 atm and a temperature of 24 degrees Celsius in a rigid 25 L tank. How many moles of argon does this tank contain?

The answer to your question is  n = 125.2 moles

Explanation:

Data

Pressure = P = 122 atm

Temperature = T = 24°C

Volume = V = 25 L

moles = n = ?

Ideal gas constant = R = 0.082 atm L /mol°K

Process

1.- Convert temperature to °K

Temperature = 24 + 273 = 297°K

2.- Use the ideal gas equation to solve this problem

          PV = nRT

-Solve for n

         n = PV / RT

-Substitution

         n = (122 x 25) / (0.082 x 297)

-Simplification

         n = 3050 / 24.354

-Result

         n = 125.2 moles

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

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