Question

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Answer 1

CH4 + 2O2 → CO2 + 2H2O

1 V 2 V 1 V

2C2H2 + 5O2 → 4CO2 + 2H2O

2 V 5 V 4 V

From the equations, we can see that

1V CH4 requires oxygen = 2 V O2

So, 10cm3 CH4 will require =20 cm3 O2

Similarly 2 V C2H2 requires = 5 V O2

So, 10 cm3 C2H2 will require = 25 cm3 O2

Now, 20 V O2 will be present in 100 V air and 25 V O2 will be present in 125 V air ,so the volume of air required is 225cm3

Answer 2

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).

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