# Chem 2

posted by .

need to figure out how to calculate.

the value of DeltaH for the reaction below is -72kj_____kj of heat are released when 1.0 mole of HBr is formed in this reaction.

H2(g)*Br2(g)> 2HBr(g)

I know the answer is 36 but need help

• Chem 2 -

The reaction as written produces 72 kJ heat and that's for 2 moles HBr. The question is for 1 mole which of course is just half that.

## Similar Questions

1. ### chemistry

Consider the following reaction: 2HBr(g)---> H_2(g) + Br_2(g) B)In the first 15.0s of this reaction, the concentration of HBr dropped from 0.510M to 0.455M. Calculate the average rate of the reaction in this time interval. C)If …
2. ### Chemistry

For the following reaction, Kp = 3.5 104 at 1495 K. H2(g) + Br2(g) 2 HBr(g) What is the value of Kp for the following reactions at 1495 K?
3. ### scuence

if known h2 + br2 produce delta h 2hbr totaled 11.2 -72 then to decipher hbr gas into H2 and br2 as much heat is required?
4. ### Chemistry

A 0.960mol quantity of Br2 is added to a 1.00 L reaction vessel that contains 1.23mol of H2 gas at 1000 K. What are the partial pressures of H2, Br2, and HBr at equilibrium?
5. ### Chemistry

A 0.960mol quantity of Br2 is added to a 1.00 L reaction vessel that contains 1.23mol of H2 gas at 1000 K. What are the partial pressures of H2, Br2, and HBr at equilibrium?
6. ### chemistry

equilibrium constant = 2.180 x 10^6 @ 730 C. H2 (g) + Br (g) <=> 2HBr (g) (reversible) startin with 3.20 moles of HBr in a 21.3-L reaction vessel, calculate the concentrations of H2, Br2, and HBr at equilibrium idk how to start …
7. ### chem

The value for ΔH° for the reaction below is -72 kJ. How many kJ of heat are released when 1.0 mol of HBr is formed in this reaction?
8. ### Chem

The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant. 2HBr(g) <--> H2(g) + Br2(g) Kc=0.322 H2(g) + Br2(g) <--> 2HBr(g) Kc= ?
9. ### AP Chem

A mixture of 1.380 g of H2 and 66.80 g of Br2 is heated in a 2.00-L vessel at 700 K. These substances react as follows. H2(g) + Br2(g) equilibrium reaction arrow 2 HBr(g) At equilibrium the vessel is found to contain 0.605 g of H2. …
10. ### chemistry

18. Calculate ƒ´H for the following reaction using Hess law H2 (g) + Br2 (g) ¡÷ 2 HBr (g) Experimental information 2 H+ ¡÷ H2 ƒ´H -436.4 kJ 2 Br- ¡÷ Br2 ƒ´H -192.5 kJ 2 H+ + 2 Br- ¡÷2 HBr ƒ´H -144.8 kJ

More Similar Questions