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1. How many grams of sodium chloride is produced when 3.4 g of sodium reacts with 8.9 g of chlorine in
this balanced equation?
2Na+ Cl₂ → 2NaCl

Sagot :

The Answer to the question is 14 grams approximately.

Atomic mass of Na = 23 u

Given mass of Na = 3.4 gm

Moles of Na = given mass of Na / molar mass of Na

Moles of Na = 3.4 / 23 moles = 0.15 moles approximately

So, 0.15 moles of Na approximately

Molar mass of Cl₂ = 35.45 × 2 = 70.9  u

Given mass of Cl₂ = 8.9 gm

Moles of Cl₂ = given mass of Cl₂ / molar mass of Cl₂

Moles of Cl₂ = 8.9 / 70.9 moles = 0.12 moles approximately

So, 0.12 moles of Cl₂ approximately

Balanced chemical equation

2Na   +     Cl₂ → 2NaCl

Ratio of Moles to Stoichiometric coefficients

0.15/2     0.12/1  

0.075  <  0.12

So, as ratio of Na is less then it will be our Limiting reagent.

Which means that Cl₂ will consume complete in the reaction.

It is clear from the reaction that 1 moles of Cl₂ are making 2 mole of NaCl

1 moles of Cl₂ → 2 mole of NaCl

0.12 moles of Cl₂ → 2 × 0.12 mole of NaCl

0.12 moles of Cl₂ → 0.24 mole of NaCl

So, 0.12 moles of Cl₂ will make 0.24 mole of NaCl

0.24 mole NaCl = mass formed NaCl / molar mass of NaCl

mass formed NaCl = 0.24 × molar mass of NaCl

mass formed NaCl = 0.24 × 58.44

mass formed NaCl = 0.24 × 58.44

mass formed NaCl = 14 grams    (approximately)

14 grams of NaCl will be formed.

So, approximately 14 grams NaCl is formed from 3.4 grams of Na and 8.9 grams of Cl.

Learn more about Limiting Reagent here:

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