1.What is atomicity? Calculate the Atomicity of- CuSO4,HCl, PbNO3,S8,NaCl,H2CO3
2.Calculate the ratio by number of atoms in water molecule? ( Mass Ratio of H:O in water is 1:8)
3. Calculate the molecular masses of:NaCl , CuSO4 , H2CO3 and H2O (atomic masses are given above)
Answers
Question 1:
Atomicity refers to the total number of atoms present in a molecule.
Atomicity of the following molecules:
1. CuSO4 : 6
2. HCl : 2
3. PbNO3 : 5
4. NaCl : 2
5. H2CO3 : 6
6. S8 : 8
Question 2:
Water molecule has the following atoms:
2 Hydrogen atoms and 1 Oxygen atom.
So, required ratio is :
H : O = 2 : 1
Question 3:
Molecular mass is total mass of a molecule constituted by the individual atoms of that molecule.
NaCl : 23 + 35.5 = 58.5 g/mol
CuSO4 : 64 + 32 + (4×16) = 160 g/mol
H2CO3 : (2×1) + 12 + (16×3) = 62 g/mol
H2O : (2×1) + 16 = 18 g/mol.
Hope It Helps.
Answer:
1) Atomicity of :
- CuSO₄ = 6
- HCl = 2
- Pb(NO₃)₂ = 9
- NaCl = 2
- H₂CO₃ = 6
2) Ratio of atoms = H : O
= 2 : 1
3) Molecular mass of :
- NaCl = 58.5g
- CuSO₄ = 159g
- H₂CO₃ = 62g
- H₂O = 18g
Explanation:
1) 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) We know that, chemical formula of water = H₂O
Number of atoms of H = 2
Number of atoms of O = 1
Hence,
Ratio of atoms = H : O
= 2 : 1
3) Molecular mass of :
NaCl = Mass of Na + Mass of Cl
= 23 + 35.5
= 58.5g
CuSO₄ = Mass of Cu + Mass of S + Mass of O
= 63 + 32 + 4*16
= 63 + 32 + 64
= 159g
H₂CO₃ = Mass of H + Mass of C + Mass of O
= 1*2 + 12 + 16*3
= 2 + 12 + 48
= 62g
H₂O = Mass of H + Mass of O
= 1*2 + 16
= 2 + 16
= 18g