Question

Area of acceleration – time graph is ……………… (1/2M )
A) a,v B) v,a C) s,v D) v,s
Where a= acceleration, v=velocity ,s= displacement

Answer 1

Answer:

The molecular mass of C

2

F

4

containing C-12 is 2(12)+4(19)=100 g/mol

The molecular mass of C

2

F

4

containing one C-12 and one C-13 is 12+13+4(19)=101 g/mol

Natural abundances of C-12 and C-13 isotopes of carbon are 99% and 1%, respectively.

100 C

2

F

4

molecules will have 200 C atoms out of whic 1% or 2 C atoms will be C-13. Assuming that these two C-13 atoms will be in different C

2

F

4

molecules, the percentage of C

2

F

4

having a molecular mass of 101 is

200

2

×100=1 %