Me! need bad! and if can explain i would really appreciate it you!

3 O2

Explanation: This a combustion reaction where a hydrocarbon reacts with oxygen gas to form CO2 and H2O.

The balance equation is:

C2H5OH + 3O2 => 2CO2 + 3 H2O

The number of atoms in the reactant and product side is the same.

Reactant Product

C 2 2 x 1 = 2

H 5+1= 6 3x2 = 6

O (2x3) +1 = 7 3+ (2x2) = 7

So the equation is now balanced.

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explanation:

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.