Given that E°red = -0.45 V for Fe 2+/Fe at 25°C, find E° and E for the concentration cell expressed using shorthand notation below. Fe(s) ∣ Fe 2+(1.0 × 10-5 M) ‖ Fe 2+(0.100 M) ∣ Fe(s)

if you mean hydrogen and oxygen then water is the product

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.