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KengaRu [80]
3 years ago
9

How can you use the periodic table to find the number of protons in one atom of an element?

Chemistry
1 answer:
Ad libitum [116K]3 years ago
8 0
The number of protons is the same as the atomic number of the element. So if you look for the atomic number of an element on your periodic table, then you can find the number of protons.
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At STP, a 50.-gram sample of H2O(l) and a 100.-gram sample of H2O(1) have
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The same chemical properties

Explanation:

Different masses of water at the same temp and pressure will have different volumes and the same empirical formulas and the same chemical properties

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PLEASE HELP ASAP SCIENCE!!!!Which of the following is a main function of a stem? to store food for the plant to bring water to t
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Which statement describes the composition of potassium chlorate, KClO3?
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The statement that best describes the composition of potassium chlorate, KCIO3 is "<span> The proportion by mass of elements combined in potassium chlorate is fixed."</span>
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Which of the following best describes the relationship of solar UV radiation to the environment?
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3 years ago
When 60 mL of 0.22 M NH4Cl is added to 60 mL of 0.22 M NH3, relative to the pH of the 0.10 M NH3 solution the pH of the resultin
densk [106]

Answer:

Will be more acidic

Explanation:

The equilibrium of NH3 in water is:

NH3(aq) + H2O(l) ⇄ NH4⁺(aq) + OH⁻(aq).

Where equilibrium constant, Kb, is:

Kb = 1.85x10⁻⁵ = [NH4⁺] [OH⁻] / [NH3]

From 0.10M NH3, the reaction will produce X of NH4⁺ and X of OH⁻ and Kb will be:

1.85x10⁻⁵ = [X] [X] / [0.10M]

1.8x10⁻⁶ = X²

X = 1.34x10⁻³ = [OH⁻]

As pOH = -log[OH⁻] = 2.87

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Now, to find the pH of the NH4Cl and NH3 we need to use H-H equation for bases:

pOH = pKb + log [NH4⁺] / [NH3]

<em>Where pKb is -log Kb = 4.74 and [] are moles of both compounds.</em>

<em />

Moles of [NH4⁺] = [NH3] = 60mL, 0.060L*0.22M = 0.0132moles:

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That means the pH of the resulting solution will be more acidic

7 0
3 years ago
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