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CBSE Class 11-science Answered

When 200 cm cube of ethylene is burnt in sufficient air to form CO2 and steam and all measurements are made at constant pressure and 100 °C  how do we calculate unreacted air? 

Asked by minhaalms | 25 Jul, 2019, 01:04: AM
Expert Answer
At constant Pressure and Tempreature conditions, Volume is directly proportional to number of moles.PV equals nRT
0.001 cross times 1 equals straight n cross times 0.0821 cross times 373
straight n equals 3.2655 cross times 10 to the power of negative 5 end exponent space space left parenthesis space straight n equals number space of space moles space of space straight C subscript 2 straight H subscript 4 right parenthesis

According space to space stoichiometry comma
straight C subscript 2 straight H subscript 4 space end subscript space plus space space 3 straight O subscript 2 space end subscript space rightwards arrow 2 CO subscript 2 space plus space 2 straight H subscript 2 space end subscript straight O space space space

3.2655 cross times 10 to the power of negative 5 end exponent space space space
So space for space one space mole space equals space 3 space moles space of space straight O subscript 2 space is space required
For space 3.2655 cross times 10 to the power of negative 5 end exponent space equals space 3.2655 cross times 10 to the power of negative 5 end exponent space cross times 3 space moles space of space straight O subscript 2 space is space needed

space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 9.79 cross times 10 to the power of negative 5 end exponent space moles space of space straight O subscript 2 space end subscript

If space straight x space is space total space moles space of space straight O subscript 2 comma space then space number space of space moles space left space of space straight O subscript 2 equals straight x minus 9.79 cross times 10 to the power of negative 5 end exponent space moles space of space straight O subscript 2 space end subscript
straight x space ammount space is space not space mentioned space in space data.
Answered by Ravi | 26 Jul, 2019, 07:31: PM
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