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Determine the number of protons present ...

Determine the number of protons present in 5.6 L of a sample of oxygen gas at STP, containing `""^(16)O` isotope only.

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Number of oxygen molecules present in 22.4 L of the gas at STP=`6.022xx10^(23)`
`therefore5.6L` of oxygen at STP contains`=(5.6xx6.022xx10^(23))/(22.4)`
`=1.50055xx10^(23)` molecules
Number of O-atoms in the given volume of the gas
`=2xx1.50055xx10^(23)=3.011xx10^(23)" "[because" Oxygen is diatomic"]`
Now, each `""^(16)O` atom contains 8 protons.
`therefore`Number of protons in `3.011xx10^(23)` atoms of oxygen
`=8xx3.011xx10^(23)=2.4088xx10^(24)`.
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