Question

You are asked by your teacher to buy 10 moles of distilled water from a shop where small bottles each containing 20 g of such water are available. How many bottles will you buy?

Answer 1

Given:

No. of moles = 10mol 

Mass of water in each bottle = 20g 

As we know that molar mass of water (H₂O) is 18g/mol 

Hence, we can say that 1mole of water = 18g 

10 moles of water = 18 × 10 = 180g 

Number of bottles = 180g /20g = 9 

Thus, we will buy 9 bottles.