Thank you for the opportunity to help you with your question!
First you need to find mass of the solution:
mass of solution is 500mL*1.28g/mL = 640 g
And now you can find mass of sulfuric acid in this solution:
mass of H2SO4 in this solution is: 640 g*0.381 = 243.84g
Please let me know if you need any clarification. I'm always happy to answer your questions.
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