N[Fe(NO₃)₃]=15.0 mol
n(O)=3×3×n[Fe(NO₃)₃]=9n[Fe(NO₃)₃]
n(O)=9×15.0=135.0 mol
The answer is A 2.5x10-4M
Answer: HA + H2O ⇌ H3O+ + H- (option #4)
Explanation: Since the acid is weak you have to use a ⇌ (equilibrium) sign. Equilibrium is denoted in a chemical equation by the ⇌ symbol. Also, when any acid dissolves into water, it produces hydronium (H3O+ or H+). Therefore, the fourth chemical reaction is your answer.
Two electron pairs is the answer
<u>Explanation:</u>
Unit is defined as the quantity that is used as a standard for measurement.
S.I. unit of mass of kilograms. Other units in which mass of a substance can be measured are grams, milligrams, etc...
All these units are inter convertible.
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