Another way to harvest the energy is to carry out the conversion of the h2 (g) to h2o (l) in a fuel cell that generates electricity. if the fuel cell is used to provide 1 milliwatt (mw) of power for a small light, and the limiting reactant in the cell is 20 g of h2, calculate the maximum length of time (seconds) the light can operate at 25°c. notes: the reaction stops when the limiting reactant is used up. other reactants are by definition excess reactants, which means that some amount of them will be left over when the reaction stops. also, only the gibbs free energy is available to be converted into electricity!

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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~ trueboss72

the answer is true. hope it .