If the density of a 40.0 mass % solution of ethylene glycol in water is 1.0514g/mL at 20 celcius what is the molarity

Answer 1

Note the correct spelling of celsius.
40% w/w means 40g ethylene glycol in 100 g solution.
mols ethylene glycol in 40 g is mols = grams/molar mass = ?
Density is 1.0514 g/mL so use density = mass/volume to convert that 100 g solution to mL and change mL to L.
Then M = mols from above/L from above.