Because correct coefficients are necessary to successfully balance equation.
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Step Vi is something that is used to produces
Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.
Mole number of 75 g is 0.4 mol. NO2 is 0.8 mol and is 36.8 g.
