Atomic Structure Question 155

Question: The mass of a mol of proton and electron is

Options:

A) $ 6.023\times 10^{23}g $

B) $ 1.008g $ and $ 0.55mg $

C) $ 9.1\times {10^{-28}}kg $

D) $ 2gm $

Show Answer

Answer:

Correct Answer: B

Solution:

Mass of a proton $ =1.673\times {10^{-24}}g $ \

Mass of one mole of proton $ =9.1\times {10^{-24}}\times 6.02\times 10^{23} $

$ =10.07\times {10^{-1}}=1.008,g $

Mass of a electron $ =9.1\times {10^{-28}}g $ \

Mass of one mole of electron $ =9.1\times {10^{-28}}\times 6.02\times 10^{23} $

$ =54.78\times {10^{-5}}g=0.55,mg $ .



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