Answer:
this website should help , put the numbers in and it'll do it for you
https://calculator.academy/mass-percent-calculator/
I think the correct answer is C. Neutrons do not affect how atoms bond due to their neutral charge which makes it so that they don't affect the movement of electrons at all (chemical reactions occur when electrons are transferred/shared). Neutrons due however have a mass similar to that of a proton which means they contribute to the mass of the atom. Neutrons also effect the stability of the nucleas as shown in atoms that have radioactive isotopes. I hope this helps. Let me know if anything is unclear.
Chemical energy is in the Pontential Energy group....Maybe?
Answer:
Excess Reagent = oxygen
Explanation:
Limiting reagent: The substance that is totally consumed when the reaction is completed.
Excess reagent: The substance left after the limiting reagent is consumed completely
The balanced chemical equation for formation of water is as follow:
![2H_{2}+O_{2}\rightarrow 2H_{2}O](https://tex.z-dn.net/?f=%20%3Cstrong%3E2H_%7B2%7D%2BO_%7B2%7D%5Crightarrow%202H_%7B2%7DO%3C%2Fstrong%3E)
This means when 2 moles of hydrogen reacts with 1 mole of oxygen, 2 moles of water is produced.
Hence the ratio in which hydrogen and oxygen gas reacts is 2:1
Now if 2 mole hydrogen require 1 mole of oxygen ,then 4 mole hydrogen need 2 mole of oxygen.
![H_{2}:O_{2}=2:1](https://tex.z-dn.net/?f=%3Cstrong%3EH_%7B2%7D%3AO_%7B2%7D%3D2%3A1%3C%2Fstrong%3E)
or
![H_{2}:O_{2}=4:2](https://tex.z-dn.net/?f=%3Cstrong%3EH_%7B2%7D%3AO_%7B2%7D%3D4%3A2%3C%2Fstrong%3E)
Here 5 mole of oxygen is reacting but only 2 mole is required .
Oxygen is in excess.