Hello!
There is a useful relationship that we can use to determine the number of moles of an ideal gas at Standard Temperature and Pressure (0 °C; 1 bar).
It says that 1 mole of an ideal gas occupies 22,4 L. Knowing that we can apply the following conversion factor to go from mL of CO₂ to moles of CO₂
[tex]550 mL CO_2* \frac{1 L}{1000 mL} * \frac{1 mol CO_2}{22,4 L CO_2}=0,0246 moles CO_2 [/tex]
So, the number of moles contained in 550 mL of Carbon Dioxide at STP is 0,0246 moles
Have a nice day!
