Asynthesis reaction that is nonspontaneous and has a negative value for its heat of reaction will not occur until some heat is added
nonspontaneous exothermic re actions need enough activation energy to get them started.

a. t, t
b. t, f
c. f, t
d. f, f
e. t, t,ce

A) True/True

Explanation:

Non spontaneous exothermic reactions need to reach the activation energy to get started (like all non spontaneous reactions), usually this energy is given in the form of heat.  So you can say the second statement is True

The first one is also True, if you don't give some energy (heat) to a non spontaneous reaction it won't start. Never the less, exothermic reaction's conversion of equilibrium is decreased when heat is addeed to the system.

the temperature of the gas, in k, not celsius.

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.