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What is the mass of: (a) 0.2 mole of ...

What is the mass of:
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?

Text Solution

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(a) 0.2 mole of oxygen atoms
Mass of 1 moke of oxygen (O) atoms=16u
Mass of 0.2 mole of oxygen (O) atoms `=0.2xx16=3.2u`
(b) 0.5 mole of water molecules
Mass of 1 mole of water `(H_(2)O)` molecules=`2xx1+16=18u`
Mass of 0.5 mole of watwer `(H_(2)O` molecules=`0.5xx18=9u`
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