Question

what is the mass of 5 mole of water molecules
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Answer 1

Explanation:

(Atomic masses : H=1u,O=16u) Thus, the mass of 1 mole of water is 18 grams. Thus, the mass of 0.5 mole of water (H2O) is 9 grams

Answer 2

● Solution :-

We need to find the mass of 5 moles of water (H₂O)

As we know that ,

1 mole of water = 18 grams of water

∵ 1 H₂O = 2[ 1 ] + [ 16 ] = 2 + 16 = 18 g

Let the mass of 5 moles of H₂O be ‘x’

Now , writing the given question in the mathematical form ,

◉ 1 : 5 : : 18 : x

By multiplying means & extremes

Here ,

• Means → 5 , 18
• Extremes → x , 1

⇒ 18 × 5 = x × 1

⇒ x = 90g

Hence , mass of 5 moles of H₂O = 90g