Characteristics of projectile motion.

Objects experiencing projectile motion have a constant velocity in the horizontal direction and a constantly changing velocity in the vertical direction. The trajectory resulting from this combination always has the shape of a parabola.

Explanation:

Projectile motion is made up two independent motions: Uniform motion at constant velocity in the horizontal direction and Free-fall motion in the vertical direction. Although the horizontal and vertical motions of a projectile are independent, they are connected through the time that the object is the the air.

The equation is
2H⁺ 2e⁻ → H₂
The number of electrons transferred in reaction are2.
The potential of standard hydrogen(S.H.E) electrode can be calculated using Nervast equation
Ecell = E₀(cell)- RT/nF In [cathode]/[anode]
Where E₀cell is the standard potential of the cell with a value of 0.00V, where R is the gas
Constant = 8.34JK-1 mol-1 T is temperature in Kelvin
= 298k and F is the Faraday constant whose value is 96500 C/mol, n being the number of electrons transferred to the reaction.
substitute given
Ecell = E₀(cell) - RT/nF In [cathode]/[anode]
Ecell = E₀(cell) -RT/nF In [PH₂]/[H⁺]²
Ecell = 0.00 - 8.314 JK⁻1 mol⁻1 × 298k/2× 96500 C/mol In (1.9 atm]/[0.46]²
0.00 - 0.0129 In(8.98)
Ecell = 0.00 - 0.0129 × 6.951
Ecell is = 0.0897V