. Four grams ot a monoatomic gas with an atomic weight of 20 amu are placed in a
ID: 571773 • Letter: #
Question
. Four grams ot a monoatomic gas with an atomic weight of 20 amu are placed in an evacuated 15-L flask and closed to the atmosphere. The temperature is adjusted to 0°C. The valve is opened to an external atmosphere of 1 atm while maintaining the temperature at 0°C. a. Decide whether the following statement is true or false and explain your answer. "The pressure inside the lask will decrease as the valve is opened." b. If the hypothesis that a reaction will occur between the gas in the flask and the oxygen in the air were false, how would you explain this fact? If the hypothesis that a reaction will occur between the gas in the flask and the oxygen in the air were true, how would you explain this fact? c. d. Decide whether the following statement is true or false and explain your answer. "A homogeneous mixture of air and the gas will form in the flask."Explanation / Answer
a) True statement . Pressure inside the container decreases as the valve is opened. This happens because when the container was closed , the gas was exerting pressure while colliding with itself or with the walls but when tha valve gets opened , the gaseous molecules diffuse apart from each other and hence exert no pressure due to the collision that was taken place before and hence the pressure comes to equilibrium pressure of the surrounding.
b)oxygen is present in the atmosphere and reacts almost with every gas but in this it is not reacting with the gas present in the flask and hence the gas present must be noble or inert and it doesn't react with oxygen.
c) In this reaction we are assuming that oxygen present in the atmosphere reacts with the gas present in the flask and therefore the gas present can be any gas except the noble gas .
d)True, when the flask is opened the gas present in the flask and the gases in the air mixes up . Because mixing of gases is a spontaneous process so as soon as the flask is opened , the gas undergoes mixing with the air and hence we can say that a homogeneous mixture if air and the gas will form in the flask.
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