gas
(ii) 0.1 g atom of silver
(iii) 1 gram of carbon
(iv) 0.1 mole of 
(v) 102 atoms of calcium.
(Given Atomic masses: Ag = 108 u, S = 32 u, N = 14 u, Ca =
40 u)
Answer:
(i)1
mole of 
molecules
i.e., 6.02 X 1023 molecules of 
of 
molecules of 
= 7.31g
(ii)1 g atom of Ag = Gram atomic mass of Ag = 108 g
0.1 g atom of Ag = 0.1 x 108
g = 10.8 g
= 8 + 10 = 18 u
(iii) 1 g of carbon = 1 g
(iv) 2 mole of 
Gram molecular
mass
=2 x 1 + 32 + 4 x16 = 98g
mole of =0.1 x 98 g = 9.8
g
(v) 1023 atoms of calcium.
mole of Ca = 40 g = 6.02 x 1023 atoms of Ca
i.e., 6.02 x 1023 atoms of Ca have mass = 40 g
1023 atoms of Ca
have mass 
Thus, masses in the decreasing order are:
g atom of Ag > 0.1 mole >
1023 molecules of > 1023
atoms of Ca 1 g carbon
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