Answer:0.15
Explanation: In order to find the number of moles of carbon dioxide in the flask, we need to know the volume of the flask, the temperature and pressure at which the gas was measured, and the molar mass of carbon dioxide.
Assuming that the volume of the flask is 22.4 liters, the temperature is 25 degrees Celsius, and the pressure is 1 atmosphere, we can use the ideal gas law to calculate the number of moles of carbon dioxide in the flask. The ideal gas law states that the volume of a gas is directly proportional to the number of moles of the gas and the temperature, and inversely proportional to the pressure.
Given these values, we can use the following formula to calculate the number of moles of carbon dioxide in the flask:
moles = (volume * pressure) / (R * temperature)
where R is the ideal gas constant, which has a value of 8.3144621 J/mol*K.
Plugging in the values we know, we get:
moles = (22.4 L * 1 atm) / (8.3144621 J/mol*K * 298.15 K)
Solving for moles, we get:
moles = 0.151857 moles
Thus, there are approximately 0.15 moles of carbon dioxide in the flask.