The mass of a molecule of a substance is its molecular mass (m). molecular mass is measured in universal mass units (u). one universal mass unit (1 u) is approximately the mass of a proton. hydrogen gas has a molecular mass of 2.0158 u. a. type the formula "h2" into the reactants box. what is the molar mass of hydrogen gas, h2? b. what is the relationship between the molecular mass and the molar mass of a substance?

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Explanation:

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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.