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3 years ago

An atom of 118Xe contains___ neutrons?A) 118 B) 54 C) 64 D) 172 E) 110

Chemistry

1 answer:

aleksandrvk [35]3 years ago

4 0

Answer:

An atom of ¹¹⁸Xe contains 64 neutrons.

Explanation:

Number of Protons:

The number of protons present in any atom are equal to the atomic number of that particular atom. Hence, as the atomic number of Xenon is 54 therefore, it contains 54 protons.

Number Neutrons:

The number of neutrons present in atom are calculated as,

# of Neutrons = Atomic Mass - # of protons

As given,

Atomic Mass = 118

# of Protons = 54

So,

# of Neutrons = 118 - 54

# of Neutrons = 64

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3 years ago

A wooden artifact from a Chinese temple has a 14C activity of 42.8 counts per minute as compared with an activity of 58.2 counts

Arlecino [84]

Answer : The age of the artifact is, $2.54\times 10^3\text{ years}$

Explanation :

Half-life = 5715 years

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$k=1.21\times 10^{-4}\text{ years}^{-1}$

Now we have to calculate the time taken to decay.

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

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t = time taken by sample = ?

a = initial activity of the reactant = 58.2 counts per minute

a - x = activity left after decay process = 42.8 counts per minute

Now put all the given values in above equation, we get

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3 years ago

Calculate how many grams of oxygen form when 2.72 g of KCIOg reacts completely given the

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1.06g

Please refer to the image attached.

You first find the number of moles (n) for KClO3 as you have been given the mass. So n = mass/Mr gives you the moles that is 0.022 mol

Next you use the ratio 2:3 as per the equation where it's 2KClO3 ---> 3O2 so you just cross multiply and get the moles for oxygen.

Now that you know the number of moles for oxygen, you can use the same moles equation that you used earlier to find the mass. mass=n×Mr and so you get the answer as 1.06g of oxygen.

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2 years ago

HELP<br> How can you tell if mass is being conserved

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2 years ago

An atom of 118Xe contains___ neutrons?A) 118 B) 54 C) 64 D) 172 E) 110​

An atom of 118Xe contains___ neutrons?A) 118 B) 54 C) 64 D) 172 E) 110