# Chemistry

The element Sc has hcp packing with a hexagonal unit cell. The density of scandium is 3.00E3 kg/m3 and the cell volume is 5.00E-26 L. Calculate the value of Avogadro's number to 3 significant figures based on these data. Note: the value may differ from the listed value.

1. 👍 0
2. 👎 0
3. 👁 126
1. I could convert 3.00E3 kg/m^3 to density of ?? g/cc.
Then mass of unit cell is volume x density = xx grams.
The hexagonal close packing produces 2 atoms/unit cell; therefore, that is the mass for 2 atoms. Divide by 2 to obtain the mass of 1 atom.
Then look up the mass of Sc from the periodic table and that mass is the mass of a mole which contains Avogadro's number of atoms.
Then,
N = atomic mass x (1 atom/?? g) = xx atoms. I worked through this very fast and obtained about 6 x 10^23.
Check my thinking. Check my work.

1. 👍 0
2. 👎 0
posted by DrBob222
2. My answer that i got is 5.99E22

i followed your step all the way till the periodic table..

from there i got Sc atomic mass as 44.96 g

then i multiply it by i atom/7.50E-22

1. 👍 0
2. 👎 0
posted by roxanne
3. yes. That's the answer I obtaied also. On the others you posted above, I didn't go through any of them in detail. They follow the same general principles. But if you have trouble, post your work and tell us in detail about what you don't understand.

1. 👍 0
2. 👎 0
posted by drbob222

## Similar Questions

1. ### Chemistry

The element Sc has hcp packing with a hexagonal unit cell. The density of Sc is 3000 kg/m3. Calculate the volume (L) of the unit cell of Sc. Sc Molar Mass =44.956 It is hcp, so it has 2 atoms/unit cell. I would appreciate any help

asked by Jenny Selby on February 8, 2017
2. ### Chemistry

An element has hcp packing with a hexagonal unit cell. Its density is 4.5 g/cm3 and the unit cell volume is 3.53 x 10-23 mL. Calculate the molar mass (g/mol) of the element to three significant figures.

asked by Linda on May 13, 2009
3. ### chemistry

An element has hcp packing with a hexagonal unit cell. Its density is 21000 kg/m3 and the unit cell volume is 2.94 x 10-23 mL. Calculate the molar mass (g/mol) of the element to three significant figures.

asked by Luc on February 9, 2010
4. ### Chemistry

An element has hcp packing with a hexagonal unit cell. the volume of the unit cell is 5.71E-26 L. Calculate the density (kg/m3) of the element.

asked by roxanne on February 4, 2008
5. ### Chemistry

An element has bcc packing with a body-centered cubic unit cell. Its density is 19300 kg/m3 and the unit cell volume is 3.17 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures. The element

asked by Dan on February 8, 2010
6. ### chemistry

The element lithium has bcc packing with a body-centered cubic unit cell. The volume of the unit cell is 4.32 x 10-26 L. Calculate the density (g/cm3) of the element.

asked by tweety on February 21, 2009
7. ### Chemistry

The element niobium has bcc packing with a body-centered cubic unit cell. The volume of the unit cell is 3.59 x 10-26 L. Calculate the density (g/cm3) of the element

asked by Anon on May 12, 2010
8. ### chemistry

The element strontium has ccp packing with a face-centered cubic unit cell. The volume of the unit cell is 2.25 x 10-25 L. Calculate the density (g/mL) of the element.

asked by ana on October 17, 2011
9. ### Chemistry

An element has ccp packing with a face-centered cubic unit cell. Its density is 8.92 g/cm3 and the unit cell volume is 4.72 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures.

asked by Kristina on May 16, 2009
10. ### Chemistry

An element has ccp packing with a face-centered cubic unit cell. Its density is 8.92 g/cm3 and the unit cell volume is 4.72 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures.

asked by Kristina on May 16, 2009

More Similar Questions