Posted by **sandy** on Saturday, May 7, 2011 at 10:56am.

how can i calculate the number of: 1.molecules in 30g water.2.atoms in 50 dm^3 nitrogen gas.3.nucleons in 10 cm^3 flourine gas?

- Physical science -
**DrBob222**, Saturday, May 7, 2011 at 12:34pm
1. Hint:

One mole of water (18 grams) contains 6.022E23 molecules of H2O).

2. Hint: There are 6.022E23 molecules in 1 mole N2 which occupies 22.4 L at STP and the number of atoms is twice that.

3. Hint:How many moles F2 do you have? That will be 10cc/22,400 = ??

How many F2 molecules do you have? That will be moles x 6.022E23. How many atoms F2 do you have. You will have twice the number of molecules. How many nucleons do you have? There are 9 protons and 10 neutrons in each molecule of F2.

- Physical science -
**john**, Wednesday, August 13, 2014 at 3:31pm
Calculate the total number of ions in 2,0g K2SO4

- Physical science -
**Kajol**, Thursday, August 14, 2014 at 12:57pm
3.13E23

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