27.0 g piece of aluminum (which has a molar heat capacity of 24.03 J/oC mol) is heated to 94.2 oC and dropped into a coffee cup calorimeter containing water initially at 19.9 oC. The final temperature of the water and aluminum mixture is 23.3 oC. Calculate the mass of water in the calorimeter. The specific heat of water is 4.184 J/g oC.

confused

confused             hewdejdnjnjsnd

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.