N-butyl acetate (molar mass = 116.2 grams per mole) is an ester that is used to give a fruity flavor to baked
goods and candy. a gallon of this substance weighs 7.35 pounds. since there are 453.6 grams in a pound (
how many moles of n-butyl acetate are in a 55.0-gallon drum of this material?

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.  

you did not give any options thus this is the best answer i can give to you with this little information you have given

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