6.) Calculate the number of moles, molecules and
S-atoms in 16 gram of S8. Given that gram atomic
mass of Sis 32g.
Answers
Answer:
Molar mass of S8 = 256 g mol-1
We know,
1 mole of S8 = Molar mass of S8 = 6.022 x 1023 molecules
256 g of S8 = 6.022 x 1023 molecules
begin mathsize 12px style Hence comma space 16 space straight g space of space straight S subscript 8 space equals space fraction numerator 6.022 space cross times space 10 to the power of 23 space cross times space 16 over denominator 256 end fraction space space molecules
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 3.76 space straight x space 1022 space molecules end style
Therefore, 16 g of S8 contains 3.76 x 1022 molecules.
(b) Molar mass of water (H2O)
= (2 x atomic mass of H) + (1 x atomic mass of O)
= (2 x 1) + 16
= 18 g
18 g of water = 1 mole
begin mathsize 12px style Hence comma space 20 space straight g space of space water space equals space 20 over 18
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1.11 space mole end style
Answered by | 16th Mar, 2015, 01:43: PM
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