1. Morse equation

Pi = kMRT

k is the Van't Hoff factor which for sucrose is 1 because it isn't ionic, it dissociates into 1 component.
M is the molarity of the solution which we are solving for
R is the gas constant L*atm/(mol*K)
T is the absolute temperature (300K)
Pi is osmotic pressure which is given as 8.45 atm

(8.45)/[1*300*.082)] = M .34 mols/L

M * V = mols of sucrose so .34[mols/L] * .513[L] = .174 mols

MW of sucrose is 342.3 g/mol so 342.3 [g/mol] * .174 [mols] = 59.96 grams of sucrose

Pay me 90 and I will post the other two answers

tried entering that was incorrect

Its sig figs, I used more digits on the gas constant and got 60.27561

still wrong and i thats pretty similar to what i got (60.2)

Ask the instructor I've had plenty of online homework that was incorrect. Show them every step you did and they will look into it.

i got 60 grams (with sig figs because temperature only has 1 sig fig).