How Many Molecules of Aspirin (Formula Mass Aspirin = 180 $10 ^ { 23 }$

Multiple Choice

How many molecules of aspirin (formula mass aspirin = 180.0 amu) are there in a 0.250-gram sample?

A) 6.02 × $10 ^ { 23 }$
B) 8.36 × $10 ^ { 20 }$
C) 1.51 × $10 ^ { 23 }$
D) More information is needed.