Question

An oxide iron contains 40% oxygen. Calculate the number of oxygen atoms in it (given molecular

wt=160)
(a) 2
(b) 3
(c) 5
(d) 4​

Answer 1

Iron oxide:

Given, molecular weight = 160 g

Weight of oxygen in the compound = 40%

==> 40/100 × 160

==> 4 × 16

==> 64 g

Molar mass of O2 = 16 × 2 ==> 32 g

No. of moles = given mass / molar mass

==> 64 / 32 ==> 2 mole

Number of molecules in 2 mole

==> 6.022 × 10²⁴ × 2

==> 12.044 × 10²⁴ molecules

Number of atoms in 1 molecules = 2

•°• Number of atoms :

==> 2 × 12.044 × 10²⁴

==> 24.088 × 10²⁴ atoms

Answer 2

Answer:

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