Question

Calculate the number of iron atoms in a piece of iron weighing 28g (atomic mass of iron is 56u)
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Answer 1

Answer:

Calculate the number of iron atoms in a piece of iron weighing 2.8g (Atomic mass of iron =56u). We know that 1 mole of iron element contains 6.022×1023 atoms of iron. Thus, a piece of iron metal having a mass of 2.8 grams contains 3.011×1022 atoms of iron.

Answer 2

Number of moles in 28 gram of iron= 0.5 mole

So,the number of iron atoms =Avogadro number÷ 0.5

$6.022 \times 10 {}^{23} \div 0.5$

=

$3.011 \times 10 {}^{23}$

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