Answer to Question #26769 in Other Chemistry for Gertrude Holztler
El + O2 = ElO2
The amount of moles of each participant of the reaction describes by a ratio:
n = m/M
where m - mass, grams
M - molar mass, grams/mole.
So, knowing the mass and a molar mass of an element, we can calculate the amount of moles. The moles ratio in a reaction is being described by coefficients. By the coefficient ratio of the reaction members we can calculate the needed amount of O2:
m = nM
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