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?

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.


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