If 156.6 grams of isotope decays to 3.5 grams,

passing a magnet thought the

mixture , because iron gets attracted to magnet .

your answer is c) plasma

~*"auba14"*~

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.