Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
?
? asked in Science & MathematicsChemistry · 2 weeks ago

How much heat is emitted when 4.54 g of water condenses at 25 ∘C? The heat of vaporization of water at 25 ∘C is 44.0 kJ/mol.?

1 Answer

Relevance
  • Uncle Michael
    Lv 7
    2 weeks ago
    Favorite Answer

    Molar mass of water (H₂O) = (1.0×2 + 16.0) g/mol = 18.0 g/mol

    Moles of water condensed = (4.54 g) / (18.0 g/mol) = 0.252 mol

    Heat emitted = (0.252 mol) × (44.0 kJ/mol) = 11.1 kJ

    ====

    OR:

    (4.54 g water) × (1 mol water / 18.0 g water) × (44.0 kJ of heat) / (1 mol water)

    = 11.1 kJ of heat

Still have questions? Get your answers by asking now.