Calculating the Number of Atoms in a 12 kg Cat

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SUMMARY

The discussion focuses on calculating the number of atoms in a 12 kg cat by first determining the number of moles of atoms present. Given the atomic masses of hydrogen (1.0 u), oxygen (16 u), and carbon (12 u), and the conversion factor of 1 u = 1.66 x 10^-27 kg, participants outline the steps to find the total moles using the molar masses of these elements. The total mass of the cat is converted from kilograms to grams (12,000 grams), allowing for the calculation of moles and subsequently the total number of atoms using Avogadro's number (6.022 x 10^23 atoms/mole).

PREREQUISITES
  • Understanding of atomic mass units (u)
  • Knowledge of molar mass for hydrogen, carbon, and oxygen
  • Familiarity with Avogadro's number (6.022 x 10^23)
  • Basic skills in unit conversion (kg to grams)
NEXT STEPS
  • Calculate the total number of moles in a 12 kg mass using the formula: moles = mass (g) / molar mass (g/mole)
  • Research the composition of biological organisms to understand the proportion of hydrogen, carbon, and oxygen
  • Explore the implications of atomic calculations in biological contexts
  • Learn about the significance of Avogadro's number in chemistry
USEFUL FOR

This discussion is beneficial for students in chemistry, biology researchers, and anyone interested in understanding the molecular composition of living organisms.

GingerBread27
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I have to approximately figure out, to the nearest order of magnitude, how many moles of atoms there are in a 12 kg cat.You are also told that The masses of a hydrogen atom, an oxygen atom, and a carbon atom are 1.0 u, 16 u, and 12 u. .

all i know is that 1 u=1.66 x 10^-27 kg.
From here I am unsure where to go.
 
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There are 6.022 * 10^23 atoms in 1 mole.
Molar mass of hydrogen is around 1 g/mole...carbon is around 12 g/mole...and oxygen is about 16 g/mole...

You have 12,000 grams...you can find the moles and then thus find the atoms. :-D
 
GingerBread27 said:
I have to approximately figure out, to the nearest order of magnitude, how many moles of atoms there are in a 12 kg cat.You are also told that The masses of a hydrogen atom, an oxygen atom, and a carbon atom are 1.0 u, 16 u, and 12 u. .

all i know is that 1 u=1.66 x 10^-27 kg.
From here I am unsure where to go.

But this is a huge cat! :smile:
I would say that it mainly consists of water...

ehild
 

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