Answer
The final masses are greater than the initial mass. Energy would not be conserved, so this reaction will not spontaneously occur.
Work Step by Step
For the decay $^{11}_{6}C\rightarrow\;^{10}_{5}B +\;^{1}_{1}p$, calculate the initial mass minus the final mass. We use hydrogen instead of the proton, to balance electrons.
$$m(^{11}_{6}C)-(m(^{10}_{5}B)+m(^{1}_{1}H)) $$
$$ = 11.011434u-10.012937u-1.007825u=-0.009328u $$
The answer is negative, so the final masses are greater than the initial mass. Energy would not be conserved, so this reaction will not spontaneously occur.
