Question

You don’t have to answer everything, whatever you know could be really helpful

Answer 1

One

molar mass NaCl

Na                 = 23

Cl                   =35.5

Molar mass = 58.6

mols = 450 / 58.5

mols = 7.69 mols

Concentration = mols / L

mols = 7.69

Volume = 4.5 kg = 4.5 L  [1 liter weighs 1 kg]

C = 7.69 mol / 4.5 L

C = 1.71 mol/L

The question is unclear. I'm taking this to mean that you don't change the number of moles; you merely add 0.5 L to the volume.

Answer C = 7.69 / 5L = 1.54 mol / L

Two

I'm going to leave this. The wording just is not clear.

Three

More than you could grow in the entire planet earth for many centuries.

Ratio of sugar = 10 / (40 + 10 + 500) = 10 / 550 = 1:55 or 0.0182 to 1

Four

Guava  Juice = (36 / 100 ) * 100% = 36%

Water = (64/100 ) * 100 = 64%