The element californium (cf) sells for $1000 per µg. assuming 6.02 x 1023 atoms of cf have a mass of 251 grams, how many atoms of cf could you buy for 1 u. s. penny?

-

Solution:- It is a simple unit conversion problem. We could solve this using dimensional analysis.

We know that, 1 US dollar = 100 cents

1 cent  = 1 US penny

So, 1 US dollar = 100 US pennies

Let's make the set up starting with 1 penny as:

=

Therefore, we can bye of Cf in one US penny.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted