Question

Example 18. From 200 mg of CO2, 1021 molecules are
removed. How many moles of CO2 are left?​

Answer 1

Step-by-step explanation:

First , to determine the number of moles of CO

2

in 200g.

As formula is :

No. of moles =

Mol.wt

Wt.in g

No. of moles in 200 mg=

1000×44

200

=4.54×10

−3

moles

So now, No. of moles in 10

21

molecules=

6.02×10

23

10

21

=1.67×10

−3

moles

Now to get the number of moles left when 10

21

moles are removed from the 200g or 4.54×10

−3

moles, following calculation is done:

No. of moles left =(4.54−1.67)×10

−3

=2.88×10

−3

mol

Answer 2

Answer:

Tell you later dear ok ok wait for the answer

Step-by-step explanation:

OK then ok