Question

The oxygen - hydrogen mixture on burning produces a flame whose temperature is     o C and is used for  ​

Answer 1

Answer:

The combustion of hydrogen-oxygen mixture is used to produce water at very high temperature (≈2500

∘

C) needed for certain types of welding operations.

H

2

(g)+

2

1

O

2

(g)→H

2

O(g); ΔH=−241.8kJ

Quantity of heat (in kJ) evolved when a 180 g mixture containing equal parts of H

2

andO

2

mass burned, is:

Explanation:

Mass of mixture = 180 g

Mass of H

2

= 90 g

Mass of O

2

= 90 g

2g of hydrogen react with 18g of oxygen as per the balanced reaction

So, O

2

is limiting reagent,

Since 16 g of O

2

produce heat = -241.8 kJ

Heat produce by 90 g of O

2

=

16

−241.8

×90=−1360 kJ