According to the periodic table, carbon's molar mass is 12.011 grams per mole (that's the small number under the element). So, just multiply like this to get the answer:

So, there are approximately 0.208 grams in 2.5 moles of carbon.
Answer:
The answer is C... I am almost positive.
The -1 charge means that there is one more electron than protons, so there are 85 protons