I think its B, however not 100% sure. Hope that helped, sort of
Answer:

Explanation:
Hello!
In this case, since the molar mass of the empirical formula is:

Thus, the ratio of the molecular to the empirical formula is:

Thus, the molecular formula is six times the empirical formula:

Best regards!
Answer:
c. 56
Explanation:
Convert molecules --> moles --> grams
1.2 x 1024 molecules CO * 1 mol/6.022 x 1023 molecules * 28.01 g/1 mol = 55.8153438
Rounded is 56
Let me know if you need further explanation!!