How many molecules of H2O in 100kg of snow? dont know where the density comes in

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SUMMARY

The discussion centers on calculating the number of molecules of H2O in 100 kg of snow, given the density of snow as 800 kg/m³. The key equation used is that 1 mole of H2O equals 6.023 x 10²³ molecules. The participant correctly calculates that 100 kg of H2O contains approximately 3.346 x 10²⁷ molecules, noting that the density of snow is irrelevant to this specific calculation. The consensus is that the density is included to add complexity but does not affect the outcome.

PREREQUISITES
  • Understanding of mole concept and Avogadro's number
  • Basic knowledge of molecular mass (H2O = 18 g/mol)
  • Familiarity with unit conversions (grams to kilograms)
  • Ability to perform calculations involving mass and moles
NEXT STEPS
  • Review the concept of density and its applications in different states of matter
  • Learn about the implications of molecular weight in chemical calculations
  • Explore the significance of Avogadro's number in stoichiometry
  • Investigate the properties of snow and its density variations under different conditions
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Students studying chemistry, particularly those focusing on stoichiometry and molecular calculations, as well as educators looking for examples of practical applications of density in chemistry.

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How many molecules of H2O in 100kg of snow?? don't know where the density comes in!

Homework Statement



How many molecules of H2O are there in 100kg of snow? Density of snow is given as 800 kg/m3

Homework Equations



1 mole = 6.023x10^23 molecules
mass/molecular mass = number of moles


The Attempt at a Solution



This is my attempt, ignoring the density.

1 mole of H2O = 6.023x10^23 molecules of H2O

Hence 18g H2O contains 6x10^23 molecules
1g = 3.346x10^22 molecules
100,000g (100kg) = 3.346x10^27 molecules of H2O

Where/how does the density come into it?
 
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Your solution is correct. You don't need the density to solve the problem, so it's there to confuse you.
 


Excellent. Thanks man
 

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