How many electrons?

Chemistry Level 2

How many electrons are present in 0.5 0.5 moles of magnesium nitrate?

The answer is of the form x × N A x × N_A , submit the value of x x .

Clarification:- N A N_A stands for Avogadro's number.


The answer is 37.

Ashish Menon by Ashish Menon , 20, India

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1 solution

Ashish Menon
Apr 23, 2016

Number of electrons in 1 mole of Mg = 12
Number of electrons in 2 moles of N = 2 × 7 = 14
Number of electrons in 6 mole of O = 8 × 6 = 48

So, number of electrons in 1 molecule of M g ( N O 3 ) 2 = 12 + 14 + 48 = 74 Mg{(NO_3)}_2 = 12 + 14 + 48 = 74

1 mole of M g ( N O 3 ) 2 Mg {(NO_3)}_2 = N A N_A molecules

So, number of molecules in 0.5 mole of M g ( N O 3 ) 2 Mg{(NO_3)}_2 = N A 2 \dfrac{N_A}{2}

So, number of electrons in 0.5 moles of M g ( N O 3 ) 2 Mg{(NO_3)}_2 = 74 × N A 2 74 × \dfrac{N_A}{2}
= 37 × N A 37 × N_A

So, x = 37 \boxed{37}

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Ya. Just remember the formula of the constituent ions. Rest is Mole Concept calculation.

Abhiram Rao - 5 years, 1 month ago

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Yep :+1:, great

Ashish Menon - 5 years, 1 month ago

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