Answer to Question #296171 in General Chemistry for acks

Question #296171
  1. A solution prepared by adding 10g of an unknown non-volatile, non-electrolyte solute to 150 g of water. The Boiling point of the solution is elevated by 0.433 0C above the normal boiling point of the solvent. What is the molar mass of the unknown substance?
1
Expert's answer
2022-02-15T15:39:02-0500

"\\Delta T_b=k_b.M.i"


Taking "k_b" of water as 0.515°C"\/m"


"0.433=0.515\u00d7M\u00d71"


"M=0.8408M"


Mass of solid in 1 kg of water

"=\\frac{1000}{150}\u00d710=66.67g"


"66.67g\\equiv0\n.8408M"


Molar mass "=\\frac{1}{0.8408}\u00d766.67"

"=79.29g"



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