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secondary 4 | Chemistry
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Can someone help me with qn 3?
Date Posted: 4 years ago
Views: 543
Good evening Annela!
Recall that 1 mol of any substance contains a total of 6 x 10^23 particles of the substance.
1 mol of sodium atoms contain 6 x 10^23 sodium atoms.
1 mol of oxygen atoms contain 6 x 10^23 oxygen atoms.
1 mol of oxygen molecules contain 6 x 10^23 oxygen molecules. This does not mean that there are 6 x 10^23 oxygen atoms.
1 mol of water molecules contain 6 x 10^23 water molecules, where each molecule consists of two hydrogen atoms and one oxygen atom, so in effect, there exist 1.2 x 10^24 hydrogen atoms and 6 x 10^23 oxygen atoms in 1 mol of water molecules.
Recall that 1 mol of any substance contains a total of 6 x 10^23 particles of the substance.
1 mol of sodium atoms contain 6 x 10^23 sodium atoms.
1 mol of oxygen atoms contain 6 x 10^23 oxygen atoms.
1 mol of oxygen molecules contain 6 x 10^23 oxygen molecules. This does not mean that there are 6 x 10^23 oxygen atoms.
1 mol of water molecules contain 6 x 10^23 water molecules, where each molecule consists of two hydrogen atoms and one oxygen atom, so in effect, there exist 1.2 x 10^24 hydrogen atoms and 6 x 10^23 oxygen atoms in 1 mol of water molecules.
Here, the Mr of Cl2 gas is 71 g/mol, so 71 g of chlorine gas is equivalent to 1 mol of Cl2 gas.
This means that there exist 6 x 10^23 chlorine molecules, where each molecule of Cl2 contains two Cl atoms. Therefore, total number of Cl atoms is twice of this, or 1.2 x 10^24 Cl atoms.
This means that there exist 6 x 10^23 chlorine molecules, where each molecule of Cl2 contains two Cl atoms. Therefore, total number of Cl atoms is twice of this, or 1.2 x 10^24 Cl atoms.
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Good evening Annela! Here are my workings for this question. Number of atoms is not the same as number of molecules in this case.
Date Posted:
4 years ago
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