10 is c, 6 is d, hope this helps !
Answer:

Explanation:
Hello there!
In this case, according to the given information, it possible for us to realize that this problem is solved via the ideal gas equation:

By which we solve for n (moles) as shown below:

Then, we plug in the given pressure, volume and temperature (in K) to obtain:

Regards!
Answer:
Atom
Explanation:
my theory:
Atoms are their own substance. It's atom because if you tried to break an atom, you would be going into nuclear physics. That would be unsafe and dangerous.