What melts ice cubes faster sugar or salt?

You will have to do an experiment to determine the answer.

You will need to think about having equal concentrations of salt or sugar in the cubes.

The size of the molecules/particles is different.

So 100 g of salt does not have the same number of molecules/particles as 100 g of sugar. The ratio of particles is 1:4.6 for the same mass of sugar to salt.

You can see that this is not an easy question to answer.

Which melts faster if the mass of salt and sugar is the same?

Which melts faster if the number of particles is the same?

The next problem is that salt actually separates into two particles when dissolved in water, sodium ions and chloride ions whereas sugar does not.

So one salt particle is actually two ions and the ratio of particles now becomes

salt:sugar = 2.3:1 for the same mass of substances.

This sounds like a great project for someone to investigate.