The density of solid fe is 7.87 g/cm3. how many atoms are present per cubic centimeter of fe?

The number of iron atoms in given amount is

Explanation:

Density of a substance is defined as the ratio of its mass and volume. The chemical equation representing density of a substance is:  

We are given:

Density of iron =

Volume of iron =

Putting values in above equation, we get:

To calculate the number of moles, we use the equation:

Given mass of iron = 7.87 g

Molar mass of iron = 55.65 g/mol

Putting values in above equation, we get:

According to mole concept:

1 mole of an element contains number of atoms.

So, 0.141 moles of iron will contain = number of atoms.

Hence, the number of iron atoms in given amount is

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the temperature of the gas, in k, not celsius.