# Chemistry

I am unsure of how to approach this question, any help would be greatly appreciated!

"2.085g of PCl5 were heated to 250°C in a 500mL vessel:
PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)

Calculate the initial concentration of PCl5. At equilibrium the concentration of the chlorine is 0.018 mol L-1."

1. 👍 0
2. 👎 0
3. 👁 108
1. This is a weirdo question. The initial concn is
mols PCl5 = grams/molar mass
M = mols/0.500 = ?
The other numbers are not needed. They would be needed if you wanted the equilibrium concn of PCl5.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry - Redox

Balance the following redox reactions by inserting the appropriate coefficients. Al + MnO2 --> Al2O3 + Mn HNO3 + H2S --> NO + S + H20 Initially, I know the first step is to find assign all the oxidation numbers for the products

asked by Harold on February 16, 2011
2. ### History

I need some help on this essay question for my history class. I'm confused. There are three instances of the theory of the Manifest Destiny in the US as we approach 1845. Name the three examples, discuss each of one and it's

asked by Josh on November 14, 2009
3. ### Physics

Two Diamonds begin a free fall from rest from the same height, 1.0 s apart. How long after the first diamond begins to fall will the two diamonds be 10m apart? Please help, I am very confused with this question, I have completed

asked by Cassie on October 19, 2011
4. ### Pre-Cal (Math)

An instructor has determined that students' grads on the final exam depend on the amount of time, t, they spend studying for it and can be modeled by the formula g(t)=(21t+10)/(20t+45). Note that the function's output is a

asked by Gio on February 17, 2016
5. ### math

Hi, I have a math question that I need help with: g:-> 3(1.3)^x State equations for any asymptotes to the graph of g. I know what an asymptote is, but I do not understand this question...so lost. Help would be greatly appreciated.

asked by christine on September 16, 2006
6. ### Algebra

A cell divides into two identical copies every 4 minutes. How many cells will exist after 5 hours? I know the answer is 2^75=3.77789x10^22 but I am unsure how 2^75 turns into 3.77789x10^22. Any help would be greatly appreciated.

asked by Mario on February 14, 2009
7. ### math analysis

(1/a)+(2/a^2)=0 Solved for zero I'm unsure about the process to solve this, when I do it like my teacher says, it doesn't work. This is for an online advanced math class in which you get three tries to solve the problem. I have

asked by Hunter on August 23, 2015
8. ### Chemistry

In a solution with carbon tetrachloride as the solvent, the compound VCl4 undergoes dimerization: 2VCl4 V2Cl8 When 6.6834 g VCl4 is dissolved in 100.0 g of carbon tetrachloride, the freezing point is lowered by 5.97*C/ Calculate

asked by Anna on December 10, 2013
9. ### Math (Instanttaneous rate of change)

Compute the instantaneous rate of change f'(a) for the function f(x) at x=a using: f'(a)=lim(h->0) (f(a+h)-f(a))/h f(x)=x^2 at x=3 My teacher didn't even go over the problem since class was over but gave us the answer being 6. How

asked by Ray on October 13, 2016
10. ### MATH! continued.......

if you could you please answer a from my previous question that would be greatly appreciated