1. A molecule of a certain substance has a mass equal to 1.2 * 10-25 kg. Determine the molar mass of the substance.

2.14 g of metal displaces 2 cm3 of hydrogen from an acid under normal conditions. Determine the molar equivalent mass of the metal oxide.

3.What is the structure of the Q-layer of an excited lead atom?

4. Compare the ionization energy of atoms: boron and carbon.

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