Copper(i) oxide, cu2o, is reduced to metallic copper by heating in a stream of hydrogen gas. what mass of water is produced when 10.00 g copper is formed?

Answer is: mass of water is 1.41 g.
Balanced chemical reaction: Cu₂O + H₂ → 2Cu + H₂O.
m(Cu) = 10.00 g.
n(Cu) = m(Cu) ÷ M(Cu).
n(Cu) = 10 g ÷ 63.55 g/mol.
n(Cu) = 0.157 mol.
From chemical reaction: n(Cu) : n(H₂O) = 2 : 1.
n(H₂O) = 0.079 mol.
m(H₂O) = n(H₂O) · M(H₂O).
m(H₂O) = 0.079 mol · 18 g/mol.
m(H₂O) = 1.41 g.

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Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?