When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2 Al ( s ) + 6 HCl ( aq ) ⟶ 2 AlCl 3 ( aq ) + 3 H 2 ( g ) What volume of H 2 ( g ) is produced when 2.80 g Al ( s ) reacts at STP?

3.49 Liters of hydrogen is produced when 2.80 grams of aluminum reacts at STP.

Explanation:

Moles of aluminum =

According to reaction , 2 moles of aluminium gives 3 moles of hydrogen gas.Then 0.1037 moles of aluminum will give:

of hydrogen gas

Moles of hydrogen gas = n = 0.1556 mol

Pressure of the gas, at STP  , P = 1 atm

Temperature of the gas, at STP = T = 273 K

Volume of the gas , At STP = V

( Ideal gas equation )

3.49 Liters of hydrogen is produced when 2.80 grams of aluminum reacts at STP.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.