Question

How many grams of chlorine gas must react with sodium iodide to form 7.50 grams of sodum chloride

Answer 1

Mass of Chlorine gas : 4.544 g

Further explanation

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Reaction Chlorine gas with Sodium iodide :

Cl₂(g)+2NaI(s)⇒2NaCl(s)+I₂(s)

Sodium chloride-NaCl produced = 7.5 g

mass NaCl(MW=58.5 g/mol) :

`\tt mol=(mass)/(MW)\\\\mol=(7.5)/(58.5)\\\\mol=0.128`

mol Cl₂ based on mol NaCl

From the equation, mol ratio Cl₂ : NaCl = 1 : 2, so mol Cl₂ :

`\tt (1)/(2)* 0.128=0.064`

mass Cl₂ (MW=71 g/mol) :

`\tt mass=mol* MW\\\\mass=0.064* 71\\\\mass=4.544~g`