Which formula can be used to calculate the molar mass of water (H2O)?

One mole of H2O is made up of 2 moles of Hydrogen atoms and 1 mode of Oxygen atom. Mass of two moles of Hydrogen atoms = 2x1 g/mol. Mass of one mole of water = 2 g/mol + 16 g/mol = 18/ mol.

Explanation:

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the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

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.

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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.