Homework Help: Physical Science

Posted by Anonymous on Monday, October 17, 2011 at 11:14am.

Estimate the volume of an atom of iron 56Fe given atomic number: 26

A.) 8.6 x 10-24 cc
B.) 1.2 x 10-23 cc
C.) 2.4 x 1024 cc
D.) 3.6 x 1024 cc

Physical Science - drwls, Monday, October 17, 2011 at 11:48am
Those two numbers will not help you compute the atomic volume.

Instead, look up the density of solid iron. It is 7.86 g/cm^3. Each atom has a mass of 56 (g/mole)/Navogadro = 9.3*10^-23 g/atom

The number of atoms per cm^3 is therefore 8.45*10^22

Each Fe atom occupies a volume (in a cubic array) of (8.45*10^22)^-1 =

1.18*10^-23 cm^3

That is pretty close to choice (B)

Answer this Question

Related Questions

Chemistry - The standard atom for the atomic masses of all the elements is the ...
Science-Periodic Table - whats the connection/relationship between the # of ...
chem1 WORD PROBLEM!! - lead has an atomic number of 82;iron has an atomic number...
chemistry - I wanted to check my True and False Chemistry HW. I am not 100% they...
chemistry - Estimate the number of atoms in 2.429 g of iron using the mass of an...
chemistry - Estimate the number of atoms in 7.827 g of iron using the mass of an...
physical science - identify the mass number and atomic number of a chlorine atom...
chemistry - 1.what is meant by atomic number of an element? 2.the mass number of...
Chemistry - 23. Ductility is the ability to be hammered into sheets.- F? 25. A ...
Final Exam- Honors Physical Science - how can you determine the number of ...

For Further Reading

First Name:
School Subject:
Answer: