A sample of C3H8 has 2.64 x 10^24 atoms.

How many carbon atoms does the sample contain?

What is the total mass of the sample?

I don't even know where to start i mean it seems like a really simple question but the prof hasn't been through this topic. Im working a bit ahead just to know how to do it. But if you can help me how to solve a question like this i would appreciate your help!