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Chemistry NMDCAT MCQs Moles and Avogadro's Numbers Moles and Avogadro’s Numbers
nmdcat.online July 2, 2026

One mole Pb(NO₃)₂ decomposes completely. The residue PbO obtained has a mass of

A. 223 g
✓
B. 446 g
C. 207 g
D. 239 g

📝 Explanation

One mole Pb(NO₃)₂ forms one mole PbO. Molar mass PbO = 207 + 16 = 223 g.

📖 Additional Information

  • 223 g
  • 446 g
  • 207 g
  • 239 g

One mole Pb(NO₃)₂ forms one mole PbO. Molar mass PbO = 207 + 16 = 223 g.

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