Question

The cost of table NaCl is Rs.20 per kg.Calculate its cost permole.​

plzzzzz answer me

Answer 1

Rs. 1.2 per mole

Step-by-step explanation:

Given parameters:

Cost of NaCl = Rs. 20 per kg

Unknown:

Cost per mole = ?

Solution:

The problem here is simply to convert the unit to:

Rs. per mole

Number of moles =
`(mass)/(molar mass)`

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Now, for 1kg;

Number of moles =
`(1000)/(58.5)` = 17.1moles

So;

`(Rs. 20)/(kg)` x
`(1kg)/(17.1moles)` = Rs. 1.2 per mole