Question

Calculate the number of iron atom in a piece of iron weighing 1.4g (atomic mass of iron = 56u

Answer 1

Given that, weight of iron =2.8 gAtomic mass= 56moles of iron= atomic masswt. of iron = 562.8 =0.05 moles1 mole =6.022×10 23 atoms0.05 moles =6.022×0.05×10 23 atoms=3.0115×10 22 atoms

Answer 2

Answer:

1.5 × (10^22) atoms.

Explanation:

$no \: of \: moles \: = \frac{given \: mass}{atomic \: mass} \\ \\ = \frac{1.4}{56} = \frac{14}{560} = \frac{1}{40} = 0.025mole \\ \\ now \: we \: know \: that \\ 1 \: mole \: = 6.02 \times {10}^{23} atoms \: \: so \: \\ 0.025mole \: = (6.02 \times {10}^{23} \times 0.025 )atoms \\ = 0.1505 \times {10}^{23} atoms \\ = 1.5 \times {10}^{22} atoms$

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