from 200 mg of CO2, 10^21 molecules are removed. how many moles of CO2 are left?
mols CO2 = grams/molar mass
There are 6.02E23 molecules in a mol.
Subtract 1E10^21 to find number left.
To find the number of moles of CO2 left, we need to follow these steps:
Step 1: Calculate the number of moles in 200 mg of CO2.
Step 2: Subtract the number of molecules removed from the total number of moles.
Step 1: Calculate the number of moles in 200 mg of CO2.
To do this, we need to use the molar mass of CO2, which is the sum of the atomic masses of one carbon (C) atom and two oxygen (O) atoms.
Molar mass of carbon (C) = 12.01 g/mol
Molar mass of oxygen (O) = 16.00 g/mol
Molar mass of CO2 = (12.01 g/mol) + 2 x (16.00 g/mol) = 44.01 g/mol
Now we can calculate the number of moles in 200 mg (0.2 g) of CO2 using its molar mass:
Number of moles = Mass of substance / Molar mass
Number of moles = 0.2 g / 44.01 g/mol
Step 2: Subtract the number of molecules removed from the total number of moles.
To get the number of moles of CO2 left, we need to subtract the number of molecules removed (10^21) from the initial number of moles.
Moles of CO2 left = Initial moles - Moles removed
Please note that Avogadro's number (6.022 x 10^23) is used to convert the number of molecules to moles.
Let's calculate it:
Moles of CO2 left = (0.2 g / 44.01 g/mol) - (10^21 molecules / (6.022 x 10^23 molecules/mol))
Using the given values, you can calculate the number of moles of CO2 left.