CBSE Class 11-science Answered
Calculate the number of atoms in
a) 160 amu of argon
b) 2.5 moles of dihydrogen
Asked by swetalinasamantaray022 | 29 Apr, 2023, 09:03: AM
Expert Answer
Dear Student,
a) Number of atoms = Mass of the substance / Atomic Mass
Hence, 160 / 40 = 40 atoms of argon in 160 amu of Argon.
b) Number of atoms of hydrogen in 2.5 moles of H2
One mole of hydrogen atoms contains 6.022x1023 atoms.
There are two hydrogen atoms in a hydrogen molecule. As, hydrogen molecule is diatomic, we multiply it by 2.
There are two hydrogen atoms in a hydrogen molecule. As, hydrogen molecule is diatomic, we multiply it by 2.
Hence, one mole of H2 contains (2 x 6.022 x 1023 = 12.044 x 1023) hydrogen atoms.
Now, 2.5 moles of H2 contain 2.5 x 12.044 x 1023 = 30.11 x 1023 atoms of hydrogen.
Answered by | 29 Apr, 2023, 05:49: PM
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