Fullerenes are molecules composed of only carbon atoms. One fullerene is C_70, a

Question

Fullerenes are molecules composed of only carbon atoms. One fullerene is C_70, a carbon molecule containing 70 carbon atoms. What is the mass of one C_70 molecule? 1 amu = 1.66 times 10^-24 g. The answer is given, show your work to get 2 extra credits. A) 1.40 times 10^-21 g B) 9.68 times 10^-24 g C) 2.85 times 10^-25 g D) 3.28 times 10^-25 g A beta particle is A)^0_-1e. B)^-1_0e. C)^1_1p D)^4_2He. Which reaction below represents^15_8O decay by positron emission? A)^15_8O rightarrow^0_-1e +^15_9Ra B)^15_8O rightarrow^0_1e +^15_7N C)^15_8O rightarrow^-1_0e +^16_8O D)^15_8O rightarrow^1_0e +^14_8O

Explanation / Answer

8) Atomic mass of Carbon = 12 amu

given that, 1 amu = 1.66 x10-24

Thus, 12 amu = 12 x (1.66 x10-24 ) = 1.99 x 10-23

C70 fullerene contains 70 carbon atom, hence mass of one molecule of C70 fullerene,

= 70 x (1.99 x 10-23) = 1.39 x 10-21 gm or nearly 1.40 x 10-21 gm

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