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How do you calculate the number of molecules?

Calculate number of ATOMS and MOLECULES?

  • Calculate the number of (A) Atoms and (B) Molecules in: A) 20.0g of Boron B) 0.30 mol of CHCL3 C)2.0 dm^3 of O3 at s.t.p I'm just a little confuse. Isn't 1 mol = 6.02x10^23 atoms/molecule? So shouldn't both number of atoms and number of molecules gives the same answer? or am I misreading this D:?

  • Answer:

    moles in boron are 20/11 and no. of atoms are 20* 6.023*10^23 (avogadro no.) B part: no of molecules are 0.3*avogadro no. moles in partC are 2/22.4 and molecules are 2* avogadro no./ 22.4

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No of atoms is for a single element!! No of molecules is for a compound!! i hope im clear! A- 11.42 X 10^23 B- 1.8069 X 10^23 C-22.4 L is one mole! So convert 2 dm^3 into Litres nd multiply it by avogadro no.

Atoms applies when the substance is composed of a single element, as is the case in part A when dealing with Boron. Molecules applies when you have a substance composed of a single compound that is composed of multiple elements, such as ChCl3.

1 mole = 6.02x10^23 PARTICLES (particles could be atoms OR molecules) ie 1 mole of O2 (oxygen gas) is 6.02x10^23 molecules. But the number of atoms there is 2 x 6.02x10^23 as there are two atoms per molecule of O2 So, in problem 3 there are 5 atoms per molecule of CHCl3.... Hope this helps you

moles in boron are 20/11 and no. of atoms are 20* 6.023*10^23 (avogadro no.) B part: no of molecules are 0.3*avogadro no. moles in partC are 2/22.4 and molecules are 2* avogadro no./ 22.4

It's just bookkeeping. 12 things = 1 dozen things Avogadro's number (NA) things = 1 mole things 1) You want 0.750 x NA 2) Convert g to moles (you should know how to do this; divide by molar mass) then multiply by NA 3) Should be obvious now 4) Multiply 2.32 by NA to get number of molecules, and then multiply by number of atoms in each molecule. Then go back over these problems, make sure you understand why the method I told you works, and you need never feel at a loss with problems like this again.

Susan

1 mole = 6.02x10^23 PARTICLES (particles could be atoms OR molecules) ie 1 mole of O2 (oxygen gas) is 6.02x10^23 molecules. But the number of atoms there is 2 x 6.02x10^23 as there are two atoms per molecule of O2 So, in problem 3 there are 5 atoms per molecule of CHCl3.... Hope this helps you

Craig C

No of atoms is for a single element!! No of molecules is for a compound!! i hope im clear! A- 11.42 X 10^23 B- 1.8069 X 10^23 C-22.4 L is one mole! So convert 2 dm^3 into Litres nd multiply it by avogadro no.

Chaitanya Malik

Atoms applies when the substance is composed of a single element, as is the case in part A when dealing with Boron. Molecules applies when you have a substance composed of a single compound that is composed of multiple elements, such as ChCl3.

MT

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