Explain why the air temperature rises, and why the plunger must be pushed in very quickly.

check explanation

Explanation:

With the work done on the gas in the Piston, the thermal energy increases. When a gas is compressed, the gas add energy.

Considering the first law of thermodynamics, the law states that heat energy cannot be created nor destroyed. The law deals with the conservation of energy. The law can be represented mathematically by the formula given below;

∆E(thermal) = Q + W(1).

Where Q= heat and W is the work done.

Also, ∆E(thermal) = W.(2).

To ignite the cotton, the thermal temperature will then increase the temperature.

This increase in thermal energy must be done quickly, for it not to be transferred to the surrounding.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2