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When a mixture of 10 moles of SO(2) and ...

When a mixture of 10 moles of `SO_(2)` and 15 moles of `O_(2)` was passed over catalyst, 8 moles of `SO_(3)` was formed. How many moles of `SO_(2)` and `O_(2)` did not enter into combination?

Text Solution

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`2SO_(2)` `+` `O_(2) rarr 2SO_(3)`
Initial `10 "mol"` `15 "mol"` 0
Final `10 - 2x` `15 - x` `2x`
`2 x = 8`
`x = 4`
Moles of `SO_(2)` left `= 10 - 2 xx 4 = 2 "mol"`
Mole of `O_(2)` left` = 15 - 4 = 11 " mol"`
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