Answer:
8.06 x 10^22
Step-by-step explanation:
1 mole of CCl4 = 12.011 + 4(35.453) = 153.823 g
1 mole of CCl4 = 153.823 g = 6.022 × 10^23 molecules
so the number of molecules in 20.6 g equals
(20.6 x 6.022 × 10^23)/153.823
= 8.0646717 x 10^22
= 8.06 x 10^22