Answer
The volume of the gas in excess remaining = 20cm³.
HBr is the gas in excess.
Step-by-step explanation
Given:
Volume of hydrogen bromide = 100cm³
Volume of ammonia = 80cm³
The equation of the reaction is given as HBr + NH₃ ------> NH₄Br
What to find:
To find the volume of the gas in excess remaining.
Step-by-step solution:
According to the mole ratio of HBr to NH₃ in the given equation of the reaction; 1 mol of HBr reacts with 1 mol of NH₃.
We can also use this for the volume ratio of HBr to NH₃; that means 80cm³ of NH₃ reacts with 80cm³ of HBr.
So HBr is the gas in excess.
Therefore, the volume of the HBr gas in excess remaining will be 100cm³ - 80cm³ = 20cm³.
HBr is the gas in excess.
The volume of the gas in excess remaining = 20cm³.