Thank you for visiting A 1 85 mole sample of Hâ Oâ weighs A 33 3 amu B 35 9 g C 62 9 g D 1 85 g. This page is designed to guide you through key points and clear explanations related to the topic at hand. We aim to make your learning experience smooth, insightful, and informative. Dive in and discover the answers you're looking for!
Answer :
Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles Hâ‚‚Oâ‚‚ is 62.9 grams.
Definition of molar mass
The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.
The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of Hâ‚‚Oâ‚‚
In this case, you know the molar mass of the elements is:
- O= 16 g/mole
- H= 1 g/mole
So, the molar mass of the compound Hâ‚‚Oâ‚‚ is calculated as:
Hâ‚‚Oâ‚‚= 2× 1 g/mole + 2× 16 g/mole
Solving:
Hâ‚‚Oâ‚‚= 34 g/mole
Mass of 1.85 moles Hâ‚‚Oâ‚‚
You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?
mass= (1.85 moles× 34 grams)÷ 1 mole
mass= 62.9 grams
Finally, the mass of 1.85 moles Hâ‚‚Oâ‚‚ is 62.9 grams.
Learn more about molar mass:
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