Question

10.

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Answer 1

Answer:

4 × 6.023 × 10^23 molecules

Explanation:

1 mole sulphur ------> 32g of sulphur

Therefore

0.5 mole of sulphur --------) 16g of sulphur

Now,

1 mole of sulphur------) 6.023 × 10^23 molecule

0.5 mole of sulphur------) 6.023 × 10^23/2 molecules

0.5 mole of S8 ------) 8×6.023×10^23/2

= 4 × 6.023 × 10^23 molecules

Answer 2

Answer:

The mass of an ion is the same as that of an atom of the same element. Atomic mass of Al = 27 u) . The number of aluminium ions (Al3+) present in one molecule of aluminium oxide is 2.

Explanation:

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