2 years ago

If an element has two or more atoms with the same number of protons but different number of neutrons it is called what

Chemistry

1 answer:

Oksana_A [137]2 years ago

8 0

It’s called an isotope which is an atom with the same number of protons but a different number of neutrons

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Explanation:

Step 1: Given data

Concentration of the base (Cb): 0.300 M

Basic dissociation constant (Kb): 1.8 × 10⁻⁵

Step 2: Write the dissociation equation

NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)

Step 3: Calculate the concentration of OH⁻

We will use the following expression.

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Step 4: Calculate the pOH

We will use the following expression.

$pOH =-log[OH^{-} ]= -log(2.3 \times 10^{-3} M) = 2.6$

Step 5: Calculate the pH

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