There is a 50 gram sample of each of the following substances: CH2O, CH3CH2OH and CH3COCH3. Which sample contains the largest number of molecules and which sample has the least number of molecules? Show your work and list the number of molecules for each sample.

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the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

that's what i got you can count the number of atoms