Question

What is the mass of a sample of CO2 if it is held at 24 degrees C, 0.544 atm in a 3.00L flask?

Answer 1

2.94g

Explanation:

Use the ideal gas law (`PV=nRT`).

Since the question asks for mass, if we find the number of moles of `CO_2`, we can multiply that by the molar mass to find the mass of the `CO_2` gas.

If we want to solve for moles, `n=(PV)/(RT)`.

Plug in values: `n=(0.544*3.00)/(0.08206*(24+273.15))`

Remember, the temperature must be in Kelvin, not Celsius.

`n=0.67`

`0.67mol` `CO_2` `xx(44g)/(1mol)=color(blue)(2.94g)`