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.

it is b that is the answer.