When a chemist burns hydrogen sulfide according to the reaction below she finds that the reaction releases heat. (It is exothermic.)
2H2S(g) + 3O2(g) 2SO2 + 2H2O(g)
The enthalpy of the reaction DH = -1037 kJ. What is the enthalpy change per gram of hydrogen sulfide ?
Fm equation 2 moles H2S = 2moles(34 g/mole) = 68 g H2S => -1037 Kj => 1 g H2s => (-1037/68) Kj/g = -15.25 Kj/g
Hi Doc48. Several days ago you and anonymous made comments on an answer I gave and I resp;onded to the two of you but no answer from either. Here is the question. It now is far away on page 13 and of course continues to move further away. Anyway, here is the link. Will you please respond to my latest response.and it would be copnvenient if you made that response t tyhis site. Thank you.
https://www.jiskha.com/questions/1790701/A-25-0-mL-sample-of-a-0-100-M-solution-of-aqueous-trimethylamine-is-titrated-with#1850477
I should have clarified. I agree with Doc48 and I just assumed you were leaving work for the individual who posted the question to do on his or her own. I was.just agreeing with Doc48's assessment.
To anonymous--Thank you for clarifying that. I appreciate it. I thought I had lost it. :-)
To determine the enthalpy change per gram of hydrogen sulfide (H2S), we need to calculate the molar mass of H2S and then use it to convert the given enthalpy change to per gram.
First, let's find the molar mass of H2S:
Molar mass of H = 1.00794 g/mol
Molar mass of S = 32.06 g/mol
Molar mass of H2S = 2(1.00794 g/mol) + 32.06 g/mol = 34.08188 g/mol (approximately 34.08 g/mol)
Now, we have the molar mass of H2S, we can proceed with the calculation.
Given:
Enthalpy change of the reaction (DH) = -1037 kJ
To convert kJ to J, multiply by 1000:
Enthalpy change in J = -1037 kJ x 1000 = -1,037,000 J
To convert J to per gram of H2S, divide by the molar mass of H2S in grams:
Enthalpy change per gram of H2S = -1,037,000 J / 34.08 g = -30,416 J/g (approximately -30,416 J/g)
Therefore, the enthalpy change per gram of hydrogen sulfide is approximately -30,416 J/g.