what mass of oxygen will contain the same no of moles present
in 50g of water
Answers
Explanation:
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Answer:
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✔There are 6.022×1023 molecules in a mole.
There are 18.01528 grams of water per mole of water.
These can be figured out using the concept of moles and molecular weight. I have attached a video that provides a good explanation.
Explanation of moles and molecular weight
Now you have all the information needed to solve the problem.
You start out with 54 grams of water. You want to convert that into molecules, but how can you do that? You can't go directly from grams to molecules because there is no easy unit conversion. However, you can go from grams to moles using
18.01528 grams of water per mole of water.
From there, you can go from moles to molecules using 6.022×1023 molecules in a mole.
A T chart is useful for this kind of problem.
54 g H2O×1 mol H2O18.0152 g H2O×6.022×1023 molecules1 mol H2O
54g H2O×1 mol H2O18.0152g H2O×6.022×1023 molecules1 mol H2O
Notice when you apply this T chart, the units cancel out, leaving molecules in the final answer, which is the correct units.
Now actually multiply everything out
54×6.022×102318.0152=1.805×1024
You are left with 1.8×1024 water molecules ...
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