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How many grams of ethanol, C₂H₅OH, can be boiled with 564.1 kJ of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol.

Calculate the mass of ethanol.

Answer :

Answer: 672.2 grams

Explanation:

With 564.1 kJ of heat energy, [tex]564.1/38.6=14.613989637306[/tex] moles of ethanol can be combusted.

So, we need to find the formula mass of ethanol.

  • The atomic mass of carbon is 12 g/mol.
  • The atomic mass of oxygen is 16 g/mol.
  • The atomic mass of hydrogen is 1 g/mol.
  • So, the formula mass of ethanol is [tex]2(12)+6(1)+16=46[/tex] g/mol.

Therefore, the mass of ethanol is [tex](46)(14.613989637306)=672.2[/tex] grams.

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