Concentration / Osmolarity Calculation

I need help figuring out how to do the correct calculation with the problem below:

"Run a serial dilution with another, safe, household kitchen chemical. You will need to look up the molecular weight of the compound, and the weight of 1 tsp for that preparation of the compound. Once you know the weight of the chemical, calculate the concentration of an isotonic solution (what osmolarity should this be?). Start at twice the concentration of the isotonic solution and testing it for lysis."

If I have sugar, and weighed out 1 tsp to be 4.44g, how would I solve the above calculation?