Mystery snail laid eggs?

My sisters black Mystery Snail has laid two clumps of eggs above the water line. We've had the snail for at least 8 months now, and it's only ever been the only one in the tank...My question is, will these eggs hatch or will they just sit there since there's no second snail to fertilize? I'm not exactly sure if these snails can fertilize their own eggs or what.
Thanks(:
 
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