Asked by Nick
A dilute sulfuric acid solution that is 3.39 molality H2SO4 has a density of 1.18 g/mL. How many moles of H2SO4 are there in 375 mL of this solution?
Answers
Answered by
DrBob222
3.39 m = 3.39 moles (332.22 g) + 1 kg solvent.
Mass of solution = 332.22g + 1,000g = 1332.22 grams.
375 mL has a mass of what?
mass = volume x density = 375 mL x 1.18 g/mL = 442.5 grams.
g solute in 375 mL = 332.22g x (442.5/1332.22) = 110.35 g which is 110.35/98 = 1.126 moles H2SO4.
Does that sound reasonable? How much solvent do we have in that 442.5 g. That will be 442.5-110.35 = 332.15 g
and 1.126 mole/0.33215 kg = 3.39 m so I think it is reasonable.
Mass of solution = 332.22g + 1,000g = 1332.22 grams.
375 mL has a mass of what?
mass = volume x density = 375 mL x 1.18 g/mL = 442.5 grams.
g solute in 375 mL = 332.22g x (442.5/1332.22) = 110.35 g which is 110.35/98 = 1.126 moles H2SO4.
Does that sound reasonable? How much solvent do we have in that 442.5 g. That will be 442.5-110.35 = 332.15 g
and 1.126 mole/0.33215 kg = 3.39 m so I think it is reasonable.
Answered by
DrBob222
A couple of things I forgot to mention.
1. I used 98 for the molar mass of H2SO4. That may not be close enough for you so you need to through the calculations and adjust numbers as appropriate.
2. I used too many significant figures and you need to adjust them. The final answer should have no more than 3.
1. I used 98 for the molar mass of H2SO4. That may not be close enough for you so you need to through the calculations and adjust numbers as appropriate.
2. I used too many significant figures and you need to adjust them. The final answer should have no more than 3.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.