# Chemistry

Confused

What is the percent composition of chlorine in PCl5?

1. 👍 0
2. 👎 0
3. 👁 417
1. out of 6 atoms, five are Cl
However by mass it is
(100)(5*35.5) /(5*35.5 + 31)

1. 👍 0
2. 👎 0
2. 31.0 + 5(35.5) = 208.5

35.5 x 5= 177.5

177.5% 208.5 x 100% = 85%

1. 👍 0
2. 👎 0
3. Yes but you intended to type:
(177.5 / 208.5) x 100% = 85%

1. 👍 0
2. 👎 0
4. yes thank you Damon !!!

1. 👍 0
2. 👎 0
5. You are welcome.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chem II

The equilibrium constant, Kp for the reaction PCl5 PCl3 + Cl2 is 1.05 at 250 degrees C. The reaction is started with PCl5, PCL3 and Cl2 at 0.177, 0.223, and 0.111 atm at 250 degrees C. When the reaction comes to equilibrium, the

asked by Ken on June 16, 2008
2. ### chemistry

The percentage yield for the reaction PCL3+Cl2-->PCL5 is 83.2%. What mass of PCL5 is expected from the reaction of 73.7g of PCL3 with excess chlorine?

asked by Brennan on January 13, 2015
3. ### Chemistry

Tin (Sn) exists in earths crust as SnO2. Calculate the percent composition by mass of Sn and O in SnO2. Please help me with this question I'm so confused

asked by Anonymous on October 15, 2019
4. ### Chemistry

You wish to know the enthalpy change for the formation of liquid PCl3 from the elements shown below. P4(s) + 6 Cl2(g)--> 4 PCl3(l) ΔH°f = ? The enthalpy change for the formation of PCl5 from the elements can be determined

asked by Kat on May 1, 2011
5. ### chemistry

What is the percent yield for the reaction PCl3(g) + Cl2(g) --> PCl5(g) if 119.3 g of PCl5 are formed when 61.3 g of Cl2 react with excess PCl3? I don't understand how to set this up?

asked by dan on July 13, 2011
1. ### chemistry

Phosphorus pentachloride, PCl5, reacts with water to form phosphoric acid, H3PO4, and hydrochloric acid, HCl. PCl5(s) + 4H2O() → H3PO4(aq) + 5HCl(aq) (a) What mass of PCl5 is needed to react with an excess quantity of H2O to

2. ### Chemistry

The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) ↔ PCl3 (g) + Cl2 (g) A vessel is charged with PCl5, giving an initial pressure of 0.123 atm. At equilibrium, the partial pressure of PCl3

asked by Zack on April 20, 2018
3. ### chemistry

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) -----> PCl3 (g)+ Cl2(g) Kc= 1.80 at 250 degrees C A 0.463 mol sample of PCl5(g) is injected into an empty 4.80 L reaction vessel held at 250 °C.

asked by Sarah on March 9, 2012
4. ### Chem 2

Phosphorus pentachloride decomposes according to the chemical equation PCl5PCl3 +Cl2 A 0.260 mol sample of PCl5(g) is injected into an empty 2.75 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and

asked by Anonymous!! on March 31, 2014
5. ### Chemistry

Phosphorus pentachloride decomposes according to the chemical equation: PCl5(g) PCl3(g)+Cl2(g) Kc = 1.80 at 250 degrees Celsius A 0.352 mol sample of PCl5(g) is injected into an empty 4.45 L reaction vessel held at 250 °C.

asked by Laura on March 8, 2013