Question

the cost of table salt and table sugar is Rs 10 per kg and Rs40 per kg respectively calculate thier cost per mole.

Answer 1

The cost of table salt and table sugar is Rs 10 per kg and Rs 40 per kg respectively calculate theIr cost per mole.

Table Salt = NaCl

Molar Mass of NaCl
= 23 + 35.5 g
= 58.5 g mol^-1

No. of moles in 1 kg
= 1000 g /58.5g
= 17.09 moles

Cost per mole
= Rs 10 / 17.09 mol
= Rs 0.585 per mole

Table Sugar = Sucrose
Molar mass of C₁₂H₂₂O₁₁
= 144 + 22 + 176
= 342 g/mol

No. of moles in 1 kg
= 1000 g/342 g/mol
= 2.92 moles

Cost per mole
= Rs 40 / 2.92 mol
= Rs 13.70 per mole