Magnesium metal reacts with a solution of silver nitrate in a
single-replacement reaction and follows the chemical reaction
below.
Mg(s) + 2AgNO3(aq) + Mg(NO3)(aq) + 2Ag(s)
If a reaction starts with 0.480 mol Mg, how many moles of
silver are produced?

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

The correct answer should be a.

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