Mole ConceptHard
Question
Which of the following statement is correct :
Options
A.1 mole of electrons has 1.6 × 10-19 C of charge.
B.1 mole of electron weighs 0.54 mg
C.1 mole of electrons weighs 5.4 mg
D.1 mole of electrons weighs 0.54 kg
Solution
(B) Explanation : 1 mole of electrons weighs = 9.1 × 10-31 kg × 6.023 × 1023
= 54 × 10-8 kg
= 54 × 10-8 × 1000 = 54 × 10-5 g
= 54 × 10-5 g × 103 mg
= 54 × 10-2 mg
= 0.54 mg
(A) is not correct because charge on 1 e is 1.6 × 10-19 C and not on 1 mole of electrons.(C) and (D) ruled out as explained above.
= 54 × 10-8 kg
= 54 × 10-8 × 1000 = 54 × 10-5 g
= 54 × 10-5 g × 103 mg
= 54 × 10-2 mg
= 0.54 mg
(A) is not correct because charge on 1 e is 1.6 × 10-19 C and not on 1 mole of electrons.(C) and (D) ruled out as explained above.
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