The answer is calcium chloride.
1/8=(1/2)^3 and the half life of radon is 3.8days
Half life is the time it takes for half of any amount of a radioactive substance to decay into something else.
Therefore for a sample of radon to decay to 1/8 of its original amount, it would take 3 x 3.8days=11.4 days
Answer: Law of conservation of mass explains these observations.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.

Mass of reactants= mass of Mg+ mass of
= 48 g + 32 g = 80 g
Mass of products = mass of
= 80 g
Thus mass of reactants is equal to mass of products, thus law of conservation of mass is obeyed.
I imagine it would be absorbed?