9. Potassium forms K+ ions and sulfur forms S2- ions. The formula of potassium sulfide is
A) KS
B) K2S —> Answer
C) KS2
D) K2S2
10. The number of hydrogen atoms in a molecule of ammonium sulfide, (NH4)2S, is
A) 2
B) 4
C) 6 —> Answer
D) 8
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9 – Correct
10 – D) 8
(NH4)2S indicates the presence of two groups with the formula NH4. Each group has 4 hydrogen atoms, so the total number is 8 hydrogen atoms.