Question

Use the periodic table to answer this question.

Sodium reacts with chlorine gas to form sodium chloride. 2Na + Cl2 → 2NaCl

What mass of chlorine gas will react with 92.0 g of sodium?


246 g Cl2

298 g Cl2

142 g Cl2

63 g Cl2

Answer 1

Answer is: mass of chlorine gas is 142 grams.
Chemical reaction: 2Na + Cl₂ → 2NaCl.
m(Na) = 92,0 g.
n(Na) = m(Na) ÷ M(Na).
n(Na) = 92 g ÷ 23 g/mol.
n(Na) = 4 mol.
From chemical reaction: n(Na) : n(Cl₂) = 2 : 1.
n(Cl₂) = 4 mol ÷ 2.
n(Cl₂) = 2 mol.
m(Cl₂) = 2 mol · 71 g/mol.
m(Cl₂) = 142 g.