how do i calculate the total number of atoms?

Question

im my chem hw, there a table, and you have to calculate the mass, moles, molecules, and total number of atoms in a sample.
each of these samples is a compound, like H2O for example. i found the number of molecules, but to find the number of atoms would i multiple the number of molecules by 3 (the number of atoms in H2O? or is this wrong? Is there another way to do it?
I mean the mole number is 6.02 X 10^23 molecules or atoms, but when u have a compound, what is the total number of atoms?
help plz!
thnx!!!!!

Answer 1

You are correct. A mole of a given molecule has a moles worth of each atom times the number of atoms in the compound. A mole of water has three moles of atoms....two hydrogen, one Oxygen.

A mole of methane CH4 has one mole of carbon and 4 moles of Hydrogen.

Answer 2

If you have 1 mole of H2O you would have 12 X 10^23 atoms of Hydrogen and 6 X 10^23 atoms of Oxygen.

If you have an amount that is not 1 mole you convert how ever much you have into molecules and then take that number times how many atoms of an element there are in that compound. So if you have 0.350 moles of C6H12O6 (glucose) and want to find the number of Hydrogen atoms you take 0.350 X (6.02 X 10^23) X 12 and you get 2.53 X 10^24 H atoms.

Answer 3

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how do i calculate the total number of atoms?
im my chem hw, there a table, and you have to calculate the mass, moles, molecules, and total number of atoms in a sample.
each of these samples is a compound, like H2O for example. i found the number of molecules, but to find the number of atoms would i multiple the number of molecules by 3 (the...

Answer 4

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This is how you do it Find the molar mass of CaH2 (molar mass of Ca + molar mass of 2H) take 11.8/ (the number you get above) multiply that by avagadro's number