Answer: Mass after three decay is 8.75 mg
Explanation: if you divide 17190 by 5730 you see three decays has happened.
So you divide mass by two three times. 70 mg :2 = 35 mg, 35 mg :2 = 17.5 mg
And 17.5 mg:2 = 8,75 mg
Go here and see how:
http://www.rsc.org/learn-chemistry/resource/res00000698/using-indigestion-tablets-to-neutralise-an-acid?cmpid=CMP00005978
If the burning of magnesium to form magnesium oxide is incomplete, there will still br some elemental magnesium available to be burned (ie combined with oxygen) and so there will be a measureable amount of mass of magnesium left. Also, the amount of oxygen required to combine with the outstanding mass of magnesium could also be determined.
Answer:
The answer is the last one
Explanation:
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