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4 years ago

How many neutrons are in an atom of oxygen with a mass number of 18? A. 8 B. 9 C. 10 D. 11

Chemistry

2 answers:

Naddik [55]4 years ago

7 0

An oxygen atom is always made up of 8 protons.

The mass number of an atom is made up of both protons and neutrons.

So to find out the number of neutrons, you subtract the number of protons from the mass number.

Number of neutrons = Mass number - number of protons

So for oxygen with a mass number of 18:

There are: 18 - 8 = 10 neutrons

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Answer:

There are 10 neutrons in an atom of oxygen with a mass number of 18.

(option C)

SashulF [63]4 years ago

3 0

Answer:

c.10

Explanation:

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4 years ago

Valence bond theory explains the bonding in diatomic molecules such as HCl without resorting to

Likurg_2 [28]

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3 years ago

The equilibrium constant, K, for the following reaction is 5.10X10 at 548 K. NH_CH(s) 2 NH3(E) + HC1(2) Calculate the equilibriu

Serga [27]

Answer:

The equilibrium concentration of HCl is 0.01707 M.

Explanation:

Equilibrium constant of the reaction = $K_c=5.10\times 10^{-6}$

Moles of ammonium chloride = 0.573 mol

Concentration of ammonium chloride = $\frac{0.573 mol}{1.00 L}=0.573 M$

$NH_4HCl(s)\rightleftharpoons 2 NH_3(g) + HCl(g)$

Initial: 0.573 0 0

At eq'm: (0.573-x) x x

We are given:

$[NH_4Cl]_{eq}=(0.573-x)$

$[HCl]_{eq}=x$

$[NH_3]_{eq}=x$

Calculating for 'x'. we get:

The expression of $K_{c}$ for above reaction follows:

$K_c=\frac{[HCl][NH_3]}{[NH_4Cl]}$

Putting values in above equation, we get:

$5.10\times 10^{-6}=\frac{x\times x}{(0.573-x)}$

$2.9223\times 10^{-6}-5.10x\times 10^{-6}=x^2$

$x^2-2.9223\times 10^{-6}+(5.10\times 10^{-6})x=0$

On solving this quadratic equation we get:

x = 0.01707 M

The equilibrium concentration of HCl is 0.01707 M.

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Answer:

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Explanation:

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2 years ago

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