How many electrons would be there in 1000ml of H2O?
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1000ml H2O contains electrons 3.3455...×1026
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How many electrons are present in 100 ml of water?
Well, the approximate answer is some simple math and a bit of background knowledge.
Let’s start with the basics:
Water consists of 1 Oxygen Atom and 2 Hydrogen: H2O
A water molecule has 10 protons (8 from the O and 1 from each H). Since a water molecule is neutral, it must have 10 electrons.
We now have to introduce the Avogadro constant “mol”. One mol equals to 6.02214179 × 10^23 atoms/molecules, or for better calculation we approximate it to ~6 × 10^&23 atom.
Now we have to calculate, how many mols 100 ml of water has. The mol weight of water is 1g/mol(H) + 1g/mol(H) + 16g/mol(O) = 18g/mol. If we want to be exact, it is actually 18.01528 g/mol.
The density of water is 1g/ml, so 100ml weigh 100g. Converting 100g to mol is thus 100g / 18g/mol = 5.56mol.
To get the number of molecules we need to multiply this with the Avogadro constant from above: 5.56mol * 6 × 10^23 molecules/mol = 3.336 × 10^24 molecules. Since each molecule has 10 electrons, we get as final result:
100ml H2O contain approximately 3.336 × 10^25 electrons,
that is a 3 followed by 25 zeros! To put that into perspective, on our earth there are approximately 7 billion people, this is a 7 followed by 9 zeros!
Well, the approximate answer is some simple math and a bit of background knowledge.
Let’s start with the basics:
Water consists of 1 Oxygen Atom and 2 Hydrogen: H2O
A water molecule has 10 protons (8 from the O and 1 from each H). Since a water molecule is neutral, it must have 10 electrons.
We now have to introduce the Avogadro constant “mol”. One mol equals to 6.02214179 × 10^23 atoms/molecules, or for better calculation we approximate it to ~6 × 10^&23 atom.
Now we have to calculate, how many mols 100 ml of water has. The mol weight of water is 1g/mol(H) + 1g/mol(H) + 16g/mol(O) = 18g/mol. If we want to be exact, it is actually 18.01528 g/mol.
The density of water is 1g/ml, so 100ml weigh 100g. Converting 100g to mol is thus 100g / 18g/mol = 5.56mol.
To get the number of molecules we need to multiply this with the Avogadro constant from above: 5.56mol * 6 × 10^23 molecules/mol = 3.336 × 10^24 molecules. Since each molecule has 10 electrons, we get as final result:
100ml H2O contain approximately 3.336 × 10^25 electrons,
that is a 3 followed by 25 zeros! To put that into perspective, on our earth there are approximately 7 billion people, this is a 7 followed by 9 zeros!
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