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You are investigating how chemical reactions occur. You place two reactants together and measure the concentration of product at regular intervals. After a time, the amount of product becomes stable.
-The atomic number of sulphur is 16. Sulphur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulphur atom, predict the molecular formula of the compound.

Question

Quizplus · Accepted Answer

Sulphur has 6 valence electrons and hydrogen has 1 valence electron. To form a stable compound, sulphur needs to share electrons to complete its octet. Thus, it would share two electrons with each of the two hydrogen atoms to form a covalent bond. This results in the molecular formula H₂S.

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