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Aug 26,  · Brass is an alloy composed of copper, Cu, and zinc, Zn. The zinc in the alloy was reacted with grams of hydrochloric acid, HCl, in excess, according to the following balanced equation: Zn (s) + 2 HCl (aq) → H 2 (g) + ZnCl 2 (aq) After all of the zinc reacted, the mass of the remaining solution weighed grams.

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An ion (/ ˈ aɪ. ɒ n,-ən /) is an atom or molecule with a net electrical charge.. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by net charge of an ion is not zero because its total number of electrons is unequal to its total number of protons.