Chlorine gas reacts with phosphorus to produce phosphorus pentachloride. How many grams of PCl₅ are produced from 3.5 g of Cl₂ and excess P
5Cl₂(g) + 2P(s) $\rarr$ 2PCl₅(s)

Question

Chlorine gas reacts with phosphorus to produce phosphorus pentachloride. How many grams of PCl₅ are produced from 3.5 g of Cl₂ and excess P 5Cl₂(g) + 2P(s) $\rarr$ 2PCl₅(s)

Quizplus · Accepted Answer

According to the balanced chemical equation, 5 moles of Cl2 reacts with 2 moles of P to produce 2 moles of PCl5. 
First, we need to convert the given amount of Cl2 to moles:
3.5 g Cl2 / 71 g/mol = 0.049 moles Cl2
Since P is in excess, we can assume that all 0.049 moles of Cl2 reacts with P to form PCl5.
Now, we can calculate the amount of PCl5 produced:
0.049 moles Cl2 x (2 moles PCl5 / 5 moles Cl2) x 208.24 g/mol = 4.12 g PCl5
Rounding to two significant figures gives us 4.1 g PCl5 as the answer, which is choice B.

Chlorine Gas Reacts with Phosphorus to Produce Phosphorus Pentachloride →\rarr→ 2PCl5(s) A) 1

Chlorine Gas Reacts with Phosphorus to Produce Phosphorus Pentachloride $\rarr$ 2PCl₅(s)
A) 1