How many grams of NaCl can be produced from 4.2 moles of Cl2? 2 Na + Cl2 --> 2 NaCl
g NaCI

There are 491.4 grams of NaCl that can be produced from 4.2 moles of Cl2.

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491.4 g

Explanation:

This a stoichiometry question, let me repeat the reaction equation here;

2 Na + Cl2 --> 2 NaCl

The balanced reaction equation must serve as a guide in solving any problem on stoichiometry.

From the balanced reaction equation;

1 mole of chlorine gas yields 2 moles of sodium chloride

Therefore, 4.2 moles of chlorine gas yields 4.2 ×2/1 = 8.4 moles of sodium chloride.

Molar mass of sodium chloride= 23 + 35.5= 58.5 gmol-1

Mass of sodium chloride formed= number of moles × molar mass

Mass of sodium chloride formed= 8.4 × 58.5= 491.4 g

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

explanation: