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secondary 4 | Chemistry
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Why is the answer b?
Date Posted: 3 years ago
Views: 258
3.16 grams of the metal reacts with 1.84 g of oxygen to form M O2.
Number of moles of oxygen reached
= 1.84 / 16 (because relative atomic mass of oxygen is roughly 16)
= 0.115
Because the ratio M : O in the solid is 1 : 2, we expect 0.0575 moles of metal to react with it.
This means that the relative atomic mass of M
= 3.16 / 0.0575
= 54.95…
From here, we see that manganese, with a relative atomic mass of 55, is probably the best option here.
Number of moles of oxygen reached
= 1.84 / 16 (because relative atomic mass of oxygen is roughly 16)
= 0.115
Because the ratio M : O in the solid is 1 : 2, we expect 0.0575 moles of metal to react with it.
This means that the relative atomic mass of M
= 3.16 / 0.0575
= 54.95…
From here, we see that manganese, with a relative atomic mass of 55, is probably the best option here.
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Answer: manganese
Date Posted:
3 years ago
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Hope this helps!
Date Posted:
3 years ago
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