SELECT * FROM question_mgmt as q WHERE id=178 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=42 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

In three moles of ethane (C2H6), calculate the following:
(i) Number of moles of carbon atoms.
(ii) Number of moles of hydrogen atoms.
(iii) Number of molecules of ethane.

Answer:

Mole is a latin term which means a pile or mass of stones placed in sea. In Chemistry a mole represents Avogadro’s number(6.022 X 1023 particles)

(i) 1 mole of C2H6 contains 2 moles of carbon atoms(because 2 carbons are present in the formula of ethane)

∴ Number of moles of carbon atoms in 3 moles of C2H6

= 2 × 3 = 6

(ii) 1 mole of C2H6 contains 6 moles of hydrogen atoms(because 6 hydrogen atoms are present in ethane)

∴ Number of moles of carbon atoms in 3 moles of C2H6

= 3 × 6 = 18

(iii) 1 mole of C2H6 contains 6.023 × 1023 molecules of ethane(because 1mole = 6.022 x 1023)

∴ Number of molecules in 3 moles of C2H6

= 3 × 6.023 × 1023 = 18.069 × 1023 


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