Question

Given the equation:2C2H2 (g) + 5O2 (g) → 4 CO2 (g) + 2H2O(g)How many moles of oxygen are required to react completely with 1.0mole of C2 H2 ?(1) 2.5 (3) 5.0(2) 2.0 (4) 10

Answer 1

Answer : The correct option is, (1) 2.5 moles

Solution : given,

Moles of
`C_2H_2` = 1 mole

The given balanced reaction is,

`2C_2H_2(g)+5O_2(g)\rightarrow 4CO_2(g)+2H_2O(g)`

From the balanced reaction, we conclude that

As, 2 moles of
`C_2H_2` react with 5 moles of
`O_2`

So, 1 mole of
`C_2H_2` react with
`(5)/(2)=2.5` moles of
`O_2`

Therefore, the number of moles of oxygen required is, 2.5 moles.