1 points If 12.6 moles of Cu and 46.8 moles of HNO3 are allowed to react, how many moles of excess reactant will remain if the reaction
goes to completion?
3 Cu + 8 HNO3 — 3Cu(NO3)2 + 2NO + 4H20

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

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