Question

Write the balanced equation, then outline the steps necessary to determine the information requested in each of the following: (a) The number of moles and the mass of chlorine, Cl2, required to react with 10.0 g of sodium metal, Na, to produce sodium chloride, NaCl. (b) Omit this part

Answer 1

Answer:

Balanced equation is: 2Na (s) + Cl₂(g) → 2NaCl (s)

Number of moles of needed Cl₂ → 0.217 moles

Mass of needed Cl₂ → 15.4 g

Explanation:

We determine the reaction

2Na (s) + Cl₂(g) → 2NaCl (s)

We convert the mass of solid Na to moles

10 g. 1 mol/23 g = 0.435 moles

Ratio is 2:1. 2 moles of Na react with 1 mol of chlorine

Then, 0.435 moles of Na may react with (0.435 . 1)/2 = 0.217 moles of Cl₂

Number of moles of needed Cl₂ → 0.217 moles

We convert the moles to mass → 0.217 mol . 70.9 g/1mol = 15.4 g