Question

Calculate the number of moles left
after removing 1021 molecules from
200 mg of CO2

a) 0.00454

b) 0.00166

c) 2.88 x 10-3
d)None of these​

Answer 1

Answer:

The answer is a option C

Answer 2

Answer:

no. of moles of in 200mg CO2=(200/44)×10^(-3)=4.54×10^(-3)

no.of CO2 molecules =no. of mole×avagadro number

i. e 4.54×6×10^20=27.24×10^20

if remove 10^21 molecules removed

i. e. (2.724-1)×10^21

no.of molecules remain =2.724×10^21=2.724×10^21

no.of moles remain=(2.724×10^21)/(6×10^23)

i. e. nearly equal to 4.54×10^(-3)=0.00454

option a is correct