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Goryan [66]
3 years ago
14

How many protons are in an element with an atomic number of 8 and a mass number of 18?

Chemistry
2 answers:
klasskru [66]3 years ago
8 0

Answer : The number of protons in an element are 8.

Explanation :

Atomic number is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

As we are given :

Atomic number of an element = 8

Mass number of an element = 18

Now we have to determine the number of protons for this element.

As, Atomic number = number of protons = number of electrons

So,

Atomic number = Number of protons = 8

Hence, the number of protons in an element are 8.

Natalija [7]3 years ago
4 0
The answer is 8. atomic number: the number of protons in the nucleus of an atom.
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True

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As we can see that 1 mol of ethane react with 1 mole of chlorine gas.the 10 moles will require 10 mole of chlorine gas, but only 9.1549 moles of chlorine gas is present.

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\frac{1}{1}\times 9.1549 mol=9.1549 mol of chloro-ethane

Mass of 9.1549 moles of chloro-ethane:

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The percent yield of  chloro-ethane in the reaction is 82.98%.

6 0
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