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Answers
1. Explanation: Atomicity is defined as the total number of atoms in a molecule
Hence,
Atomicty of CuSO₄
= Number of C-atoms + Number of S-atoms + Number of O-atoms
= 1 + 1 + 4
= 6
Atomicity of HCl
= Number of H-atoms + Number of Cl-atoms
= 1 + 1
= 2
Atomicity of Pb(NO₃)₂
= Number of Pb-atoms + Number of N-atoms + Number of O-atoms
= 1 + 2 + 6
= 9
Atomicity of NaCl
= Number of Na-atoms + Number of Cl-atoms
= 1 + 1
= 2
Atomicity of H₂CO₃
= Number of H-atoms + Number of C-atoms + Number of O-atoms
= 2 + 1 + 3
= 6
2. Explanation:
The ratio of hydrogen and oxygen by mass in water is 1:8. The atomic masses of H and O are 1 g/mol and 16 g/mol respectively. In H2O, the ratio of hydrogen and oxygen by mass will be 2:16=1:8.
3. Explanation:
NaCl- 58.5
CuSO4- 160
H2CO3- 62
H2O- 18
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