Achemical reaction is done in the setup shown , resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?

The mass of the system will remain the same if there is no conversion of mass to energy in the reaction.

Correct B. The mass will stay the same because the gases produced in the reaction are kept inside the container.

Explanation: The law of conservation of matter states that, in any physical or chemical process, matter is neither created nor destroyed. Because the amount of matter does not change, the mass must remain the same.

The reason the mass decreases in the original reaction is that one of the products of the reaction is a gas, which floats away into the surrounding air. Because the mass of the gas is removed, the mass on the scale goes down. In a closed container, the gas produced in the reaction will not escape, so the total mass inside the container does not change.

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g

its mg hope this