a) One gram atom Al
b) one gram atom Ag
c) one gram atom mg
d) two moles of hydrogen
Answers
Answer:
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Explanation:
(a) Molecular weight of Oxygen (O
2
)=32gm/mol
Again 1 molecule O
2
contains 2 atoms of oxygen atoms.
∴ Number of oxygen atoms is 4g of O
2
=
32
4
×2×6.02×10
23
=1.505×10
23
(b) Atomic weight of oxygen and hydrogen are 16gm/mol and 1gm/mole respectively.
∴6.02×10
23
atoms of Oxygen have total weight= 16gm
1 atom of oxygen has weight=
6.02
16
×10
−23
gm=2.657×10
−23
gm
Similarly, 10 hydrogen atoms have weight
=10×
6.02
1
×10
−23
gm=1.66×10
−23
gm
∴ Oxygen atom is heavier than 10 hydrogen atoms.
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Answer:
(a) no of moles = gram atom / 6.022 × 10^23
no of molecule = 1 / 6.022 × 10^23
= 0.16 × 10^-23
no of moles = mass / molar mass
0.16 × 10^-23 = mass / 26.98
mass = 4.48 × 10^-23g
(b) no of moles = gram atom / 6.022 × 10^23
= 1 / 6.022 × 10^23
no of moles = mass / molar mass
1 / 6.022 × 10^23 = mass / 107.86
mass = 17.91 × 10^-23g
(c) no of moles = gram atom / 6.022 × 10^23
= 1 / 6.022× 10^23
no of moles = mass / molar mass
1 / 6.022 × 10^23 = mass / 24.3
mass = 4.03 × 10^-23g
(d) no of moles = mass / molar mass
2 = mass / 1
mass = 2g