J.R. S. answered 08/25/22
Ph.D. University Professor with 10+ years Tutoring Experience
How is this question any different from the one you posted several hours ago. I posted an answer and demonstrated how to do these problems. If you find fault with my previous answer, please tell me what it is and maybe I can make it better. If you don't find fault with the previous answer, follow the same procedure, and at least make an attempt.
Here are my previous answers:
20.9476 g/mL X 40. mL = 837.904 g = 840 g (rounded to 2 s.f. based on 40. ml having 2 s.f.)
2.09476 cm X 2.25 cm = 4.71321 cm2 = 4.71 cm2 (rounded to 3 s.f. based on 2.25 having 3 s.f.)
806.18 mol / 0.54 L = 1,492.93 mol/L = 1500 mol/L (rounded to 2 s.f. based on 0.54 having 2 s.f.)