Given the reaction: 6CO2 + 6H2O C6H12O6 + 602
What is the total number of moles of water needed to make
2.5 moles of C6H1206?

as per the formula of given carbohydrate the answer is 15 moles

explanation:

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)