Use the problem below to answer the question: when a current is passed through a solution of salt water, sodium chloride decomposes according to the following reaction: 2nacl + 2h2o → 2naoh + cl2 + h2. how many grams of chlorine gas, cl2, are given off if 7.5 grams of sodium chloride, nacl, are decomposed? the molecular mass of nacl is 58.44 g/mole. the molecular mass of cl2 is 70.90 g/mole.

Answer : The mass of chlorine gas given off are 4.54 grams.

Solution : Given,

Mass of = 7.5 g

Molar mass of = 58.44 g/mole

Molar mass of = 70.90 g/mole

First we have to calculate the moles of .

Now we have to calculate the moles of

The balanced chemical reaction is,

From the balanced reaction we conclude that

As, 2 mole of react to give 1 mole of

So, 0.128 mole of react to give mole of

Now we have to calculate the mass of

Therefore, the mass of chlorine gas given off are 4.54 grams.

i'm assuming that it's c.) red bank..

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.