The following chemical reaction occurred. What coefficient must be placed in front of water in order for the equation to be balanced CH4+202=C02+H20
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1) how many electrons are in each energy level of the following elements? a. he b. na c. na d. ne 2) how many valence electrons are percent in the following atoms? a. s b. mg c. be d. cl 3) which of the following elements are stable as atoms? a. he b. o c. cl d. ar if you are able to provide the work as to how you got the answers that would be greatly appreciated. : )

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which element would mostly likely have an electron affinity measuring closest to zero