what is avogadro's number fine the number of molecules in (a) 56g of nitrogen gas (b) 88g of carbon dioxide (atomic mass of c=12u , n=14u , o=16 u )
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Explanation:
To Find -
- Number of molecules
a)
- 56g of N₂
Gram atomic mass (GAM) of N₂ = 14×2 = 28 g/mol
mole = mass ÷ GAM
→ 56/28
→ 2 mol
Number of molecules = mole × Nₐ
→ 2 × 6.022 × 10²³
→ 12.044 × 10²³
b)
- 88g of CO₂
Gram molecular mass (GMM) of CO₂ = 12 + 16×2 = 12+32 = 44 g/mol
mole = mass ÷ GAM
→ 88/44
→ 2 mol
Number of molecules = mole × Nₐ
→ 2 × 6.022 × 10²³
→ 12.044 × 10²³
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