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Atoms and Molecules
Q.9: What is the mass of:
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?
The number of moles of a substance is calculated by the formula given below:
(a) The atomic mass of oxygen is 16 g/mol. So, the mass of 0.2 moles of oxygen atoms is calculated as shown below:
Therefore, the correct answer is 3.2g.
(b) The molar mass of water is 18 g/mol. So, the mass of 0.5 moles of water molecules is calculated as shown below:
Therefore, the correct answer is 9g.
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