Examine the analogy and how it compares a hole to a part Chain : link :: molecule : _[blank]_

What option best completes this analogy?

- Compound
- Atom
- Volume
- Electron
Please help I need this right now ( timed test only have 2 minuets left ! )

You are performing an experiment in a lab to attempt a new method of producing pure elements from compounds. the only problem is that you do not know what element will form. by your previous calculations you know that you will have 6.3 moles of product. when it is complete, you weigh it and determine you have 604.4 grams. what element have you produced?

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

Iwould appreciate if someone could me.