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September 2, 2014

Search: If each atom has a radius of 1.43 , what is the length of a side of the unit cell?

Number of results: 31,131

chemistry
Gallium crystallizes in a primitive cubic unit cell. The length of an edge of this cube is 362 pm. What is the radius of a gallium atom? The face-centered gold crystal has an edge length of 407 pm. Based on the unit cell, calculate the density of gold. Type of atom Fraction in...
November 24, 2008 by ea

engineering
Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...
February 19, 2012 by ali

chemistry
Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...
February 19, 2012 by ali

chemistry
Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each Al atom has a radius of 1.43 angstroms, what is the length of a side of the unit cell?
October 20, 2009 by allie

drawing
Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each atom has a radius of 1.43 , what is the length of a side of the unit cell?
July 21, 2010 by Anonymous

math
what is the number of each atom in the unit cell of a BCC cystalline structure unit cell. I know its 2 atoms=8/8 +1 Calculate what % of each atom is contained within the unit cell? How do I do this
January 13, 2010 by Anonymous

CHEM
Info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners of a cube. Atoms can also be found in the ...
November 29, 2007 by K

CHEM****
Initial info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners of a cube. Atoms can also be found...
November 30, 2007 by K

Chemistry
1.The density of solid Fe is 7.87 g/cm3. What volume per atom of Fe? 2.As a solid Fe adopts a body centered cubic unit cell. What is the volume of a unit cell of this metal? 3.What is the edge length of a unit cell of Fe?
July 9, 2011 by Josh

Inorganic Chemistry
The atoms in barium metal are arranged in a body centered cubic unit cell. Calculate the radius of a barium atom in A if the density of barium is 3.50g/cm3. The atomic weight of barium is 137.34. The atoms in barium metal are arranged in a body centered cubic unit cell. ...
October 15, 2006 by Stephanie

chemistry
This problem is from my chemistry book and I am having a little trouble with the intermediary steps: Barium metal crystallizes in a body- centered cubic lattice (atoms at lattice points only) The unit cell edge length is 502 pm, and the density of the metal if 3.5g/cm^3. (...
May 18, 2010 by Tokey

Chem
Based on the number of atoms per unit cell and the mass of the atom, the mass of the unit cell can be calculated. The density of the unit cell and the material as a whole can be determined from the mass and the volume of the unit cell as. D= M/V The usual units of density are ...
January 16, 2009 by Juliee

chemistry
I have a unit cube question to which the answer is given that I'm trying to figure out. The question is: If under conditions of high pressure & temperature, the crystalline structure rearranges to form a face-centered cubic unit cell, what is the new density of the substance? ...
July 10, 2011 by unit cubes

AP chem
Second question: In the LiCl structure shown in 9.18 [LiCl's lattice, where the "Cl- ions are in contact with each other, forming a face centered cubic lattice."], the chloride ions form a face-centered cubic unit cell 0.513 nm on an edge. The ionic radius of Cl- is 0.181 nm. ...
December 7, 2006 by chris

chemistry help!
Hello, I am having problem with two lab questions and was wondering if someone can help! 1. Calculate the percentage of the empty space in a face-centered cubic lattice, and show that it does not depend on the edge length of the unit cell ot on the size of the atoms in the ...
February 4, 2010 by Dina

chemistry
Hello, I am having problem with two lab questions and was wondering if someone can help! 1. Calculate the percentage of the empty space in a face-centered cubic lattice, and show that it does not depend on the edge length of the unit cell ot on the size of the atoms in the ...
February 3, 2010 by Dina

AP Chemistry
Titanium metal has a body-centered cubic unit cell. The density of Titanium is 4.50 g/cm^3. Calculate the edge length of the unit cell and a value for the atomic radius of titanium. Ok, I know how to find the density using the atomic radius, but I'm having trouble working ...
January 1, 2008 by Nick

Chemistry
What portion of the volume of each atom or ion on the face of a unit cell is actually within the unit cell 1/2 1/4 3/4 all of it none of it
February 6, 2008 by Lauren

chemistry
Is the calculation of percentage of each atom within a Body centered cubic cell AKA volume of the BCC cell same as the atomic packing factor for the BCC unit cell. The BCC % is 68%. the atomic packing factor is just 0.68. Am I completely wrong? And also how do i calculate the ...
January 13, 2010 by Anonymous

Chemistry
Boron Phosphide, BP, is a semiconductor, and a hard, abrasion resistant material. It is made by reacting Boron tribromide and phosphorus tribromide in a hydrogen atmosphere at high temperature (>750 degrees C) (a) Write a Balanced chemical equation for the synthesis of BP (...
March 11, 2012 by Laffy Taffy

Chemistry
Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. I used this equation: density = (2)*(atomic weight) / (volume of unit cell)*(Avagodro's #) rearranged to find the volume of the unit ...
January 16, 2013 by Kyle

Chemistry
Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. I used this equation: density = (2)*(atomic weight) / (volume of unit cell)*(Avagodro's #) rearranged to find the volume of the unit ...
January 16, 2013 by Kyle

chemistry
Molybdenum (Mo) has a density of 10.22 g/cm3 and it crystalizes into a fcc unit cell, calculate the radius of a (Mo) atom?
June 7, 2011 by Lilly

chemistry
Determine the radius of the largest atom that can be accommodated in the interstices of BCC iron (Fe) without stress. (Hint: the center of the largest site is at , , 0; draw a unit cell - it helps.) Radius (in centimeters):
April 2, 2013 by adex

Chemistry
what is the volume of the unit cell? A metal crystallizes in a face-centered cubic lattice. The radius of the atom is 0.197 nm. The density of the element is 1.54 g/cm^3
February 6, 2008 by Lauren

chemistry
The unit cell of palladiu m is a cube that is 389. 03 pm on a side. There are 4 Pd ato ms in the unit cell. Calculate the density of palladium in grams per cubic centimeter.
May 17, 2011 by James

chemistry
Strontium has density of 2.64 and crystallizes with the face-centered cubic unit cell. Find the radius of the strontium atom
July 10, 2011 by hannah

Chemistry
Copper has density of 8.94 and crystallizes with the face-centered cubic unit cell. Calculate the radius of a copper atom.
January 29, 2012 by amy

Chemistry
The density of solid W is 19.3 g/cm3. How many atoms are present per cubic centimeter of W? As a solid, W adopts a body-centered cubic unit cell. How many unit cells are present per cubic centimeter of W? What is the volume of a unit cell of this metal? What is the edge length...
January 18, 2013 by Anonymous

chemistry
a metal crystallizes in the face centered cubic crystal structure with a unit cell edge of 5.48 x10 power of -8 cm. the density of the metal is 6.90 g per cubic cm. a. what is the mass (g) of a single atom of this element. b. what is the atomic weight of the element (g per mol...
December 4, 2011 by amanda

geometry
sodium has a body-centered cubic structure with a unit cell that is 430 picometers wide. estimate the radius of a sodium atom. please help me, I don't know how to get the solution. THank you
January 28, 2013 by lin

CHEM
An atom at the face of a unit cell is shared by how many unit cells? 1 2 4 6 8
May 4, 2011 by Hannah

chemistry
Determine the radius of the largest atom that can be accommodated in the interstices of BCC iron (Fe) without stress. (Hint: the center of the largest site is at , , 0; draw a unit cell - it helps.)
April 3, 2013 by adex

chemistry
Determine the radius of the largest atom that can be accommodated in the interstices of BCC iron (Fe) without stress. (Hint: the center of the largest site is at , , 0; draw a unit cell - it helps.)
April 4, 2013 by adex

chemistry
a metal crystallizes in the face centred cubic cubic crustal structure with a unit cell edge of 5.48 x10 power of -8 cm.the density of the metal is 6.90g per cubic cm. a. what is the mass in grams, of a single atom of this element. b. what is the atomic weight of the element (...
December 4, 2011 by amanda

General Chemistry
PLEASE ANSWER VERY SOON I AM STUCK! Crystalline silicon has a cubic structure. The unit cell edge length is 543 pm. The density of the solid is 2.33 g/cm3. Calculate the number of Si atoms in one unit cell.
July 14, 2010 by Kendra

college chem
metallic iron crystallizes in a cubic lattice. The unit cell edge length is 287 pm. The density of iron is 7.87 g/cm^3. Calculate the mass (in grams) of one unit cell
February 4, 2013 by luis fernandez

Gen Chem
Barium has a radius of 224 pm and crystallizes in a body-centered cubic structure. What is the edge length of the unit cell?
April 19, 2010 by gagaga

CHEMISTRY
Answer the following for a face centered unit cell. answers should be numerical. r=6.00 edge in terms of r, the lattice pt radius i know that for a primitive cubic unit cell, you would muliply 2 by 6 = 12. but what formula would u use for a FCC??? Please help. thanks
February 12, 2010 by random

Unit Cells
Copper has a unit cell volume of (47.453 A^3) and a face centered unit cell. How would I go about finding the volume of atoms within the unit cell? Would you use Avogadro's # somehow?
May 9, 2010 by CHeM

chemistry
Please help. My teacher never went over crystal lattices and the book doesn't cover it either :( Copper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 351pm, what is the radius of the copper atom?
December 10, 2012 by Jess

chemistry
for NaTl, is the unit cell of it based on the repetition of body centered cubic and the holes in this unit cell are octahedral? how many of each of the 2 cubes drawn for NaTl are required its unit cell? is it 8?
February 15, 2010 by eng

chem
The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is 5.88*10^2^2 pm. i guess it is FCC ( face cenred cubic) 1-- What are the coordination numbers of and Li^+ and S^2- in the lithium sulfide crystal shown? Enter ...
January 24, 2009 by Dr Bob plz help

Urgent Chem help.plz
The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is 5.88*10^2^2 pm. i guess it is FCC ( face cenred cubic) 1-- What are the coordination numbers of and Li^+ and S^2- in the lithium sulfide crystal shown? Enter ...
January 24, 2009 by Julia

chemistry
The radius of an atom is about 10,000 times as large as its nucleus. If the atom were enlarged such that the radius of its nucleus was 1 inch, what would be the radius of the atom in meters? I need the formula to follow so that I can solve this problem.
December 1, 2011 by george

Newton's law
7. A uniform flexible chain of length l, with weight per unit length lamba, passes over a small, frictionless, massless pulley. It is released from a rest position with a length of chain x hanging from one side and a length l-x from the other side. Find the acceleration a as a...
October 15, 2012 by Ringo

math
A Jewlery box has length of 3 and a half, a width if 1 and a half, and a height of 2 units. What is the volume if the box I cubic units? Each of the cubes in this activity has a side length of 1/2. How many cubes with side length 1/2 does it take to form a unit cube? How many ...
May 6, 2014 by Jess

Chemistry
The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: a)the coordination number of Li and S b) the number of formula nunits in the unit cell c) the density of Li2S
April 15, 2009 by Erica

physics
How does the volume of a cube change if the length of one side is increased by one unit, another side is decreased by one unit, and the third side is left unchanged? How does changing the shape of a container affect the volume of the matter?
March 3, 2012 by Anonymous

college - chemistry
Hi, I was wondering if anyone could provide me the necessary information to solve this problem. For the following elements: CdSe CsI Li2O KBr NaCl ZnS(I) I've been asked to find the -Unit Cell of Larger ion -Type of Hole where Smaller Ions are found -# of Cations per unit cell...
February 16, 2009 by Anonymous

college - chemistry
Hi, I was wondering if anyone could provide me the necessary information to solve this problem. For the following elements: CdSe CsI Li2O KBr NaCl ZnS(I) I've been asked to find the -Unit Cell of Larger ion -Type of Hole where Smaller Ions are found -# of Cations per unit cell...
February 16, 2009 by Anonymous

AP chem
I have a problem set due tomorrow, and two problems in it were not covered in class. The first is this: Molybdenum has an atomic radius of 0.145 nm. The volume of its cubic unit cell is 0.0375 nm^3. What is the geometry of the molybdenum unit cell? I have no idea where to even...
December 7, 2006 by chris

chemistry
1)The element nickel has ccp packing with a face-centered cubic unit cell. The density of nickel is 8900 kg/m3 and the cell volume is 4.376 x 10-23 cm3. Calculate the value of Avogadro's number to three significant figures based on these data. (Note: the value may differ from ...
February 4, 2010 by blasting

AP CHEMISTRY
The unit cells for most alkali metal halides are face-entered for both the cations and anions. In the case of NaCl the sodium ion is just a little too large for the chloride ions to touch each other along the face diagonal. The unit cell edge length is 564.0 pm. The sodium ion...
January 24, 2008 by Jake

Chemistry AP HELP!
Tausonite, a mineral composed of Sr, O, and Ti, has the cubic unit cell and teh chemical formula is SrTiO3..... Ti is coordinated by 6 O atoms, because the Ti is located at the center of the unit cell. To see the full coordination environment of the other ions, we have to ...
November 18, 2011 by kali mata

Chemistry
An estimation of the radius of a lead atom: a. You are given a cube of lead that is 1.000 em on each side. The density of lead is 11.35 g/cm3. How many atoms of lead are contained in the sample. b. Atoms are spherical; therefore, the lead atoms in this sample cannot fill all ...
November 13, 2011 by Arnol

Zoology
Can you rank these from the smallest to the largest? Heart carbon atom sodium atom electron nucleotide tundra mitochondria glucose molecule fungal cell hydrogen atom
August 29, 2010 by Marcus

chemistry
for NaTl, is the unit cell of it based on the repetition of body centered cubic and the holes in this unit cell are octahedral?
February 16, 2010 by eng

Chemistry
Answer the following for a face centered unit cell. how do i find: -# atoms / 1 unit cell -coordination #
February 15, 2010 by Mary

chemistry
The element K has bcc packing with a body-centered cubic unit cell. The density of K is 0.862 g/mL. Calculate the volume (L) of the unit cell of K.
February 21, 2009 by tweety

Chemistry
The element palladium has ccp packing with a face-centered cubic unit cell. The density of Pd is 12 g/cm3. Calculate the volume (L) of the unit cell of Pd.
February 9, 2010 by Luc

Chemistry
The radius of a lead atom is 175 pm. How many lead atoms would have to be laid side by side to span a distance of 4.20 mm?
September 9, 2007 by Kellie

chemistry
The radius of a barium atom is 217 pm. How many barium atoms would have to be laid side by side to span a distance of 4.33 mm?
September 25, 2011 by savannah

Chemisty
The radius of a lead atom is 175 pm. How many lead atoms would have to be laid side by side to span a distance of 1.58 mm?
January 17, 2012 by love

Chemisty
The radius of a chromium atom is 125 pm. How many chromium atoms would have to be laid side by side to span a distance of 1.62 mm?
January 18, 2012 by love

Chemistry
The radius of a chromium atom is 125 pm. How many chromium atoms would have to be laid side by side to span a distance of 4.14 mm?
September 17, 2012 by Rebecca

chemistry
The radius of a aluminum atom is 143 pm. How many aluminum atoms would have to be laid side by side to span a distance of 4.90 mm?
September 21, 2013 by sabrina

Maths
An equilateral triangle with side length 33 is divided into 33^2 smaller unit equilateral triangles each with side 1, forming a triangular lattice. We color each segment of length 1 either Red, Blue or Green, subject to the condition that each small unit equilateral triangle ...
May 1, 2013 by Maths lover Please Help...

CHemistry....Please help...DrBobb
I posted this up yesterday: I have to use the equation : density= mass/ volume: But i dont know how to find out the volume using the edge length of the unit cell which is 5.88* 10^2 pm. CHemistry....Please help - DrBob222, Sunday, January 25, 2009 at 10:41pm If the edge length...
January 26, 2009 by Saira

Chemistry-Science
Answer the following for a primitive cubic unit cell. Answers should be numerical, set r = 8.0 -edge in terms of r, the lattice pt radius:___ -face diagonal in terms of r, the lattice pt radius:___ -body diagonal in terms of r, the lattice pt radius:___ Answer the following ...
February 14, 2009 by Bliss

Math(Please help)
The radius of a niobium atom is 131 pm. How many niobium atoms would have to be laid side by side to span a distance of 1.4 mm?? I know that 10^9 is pm or is it -9??
September 11, 2011 by Hannah

Maths
An equilateral triangle with side length 33 is divided into 33^2 smaller unit equilateral triangles each with side 1, forming a triangular lattice. We color each segment of length 1 either Red, Blue or Green, subject to the condition that each small unit equilateral triangle ...
April 30, 2013 by MAths lover Please Helppppp

Math
A rectangle has parameter of 24 unit, if width is 4 unit what is length. 10 unit 6 unit 16 unit 8 units My answer is 16 unit.. I wan a make sure if I am right.
November 24, 2011 by Anonymous

mathematics
An equilateral triangle with side length 33 is divided into 332 smaller unit equilateral triangles each with side 1, forming a triangular lattice. We color each segment of length 1 either Red, Blue or Green, subject to the condition that each small unit equilateral triangle ...
April 30, 2013 by Sambaran G.

Chemistry
The density of gold is 1.93E4 kg/m3 and the cell volume is 6.78E-26 L. Determine the number of atoms in the unit cell. Note: the number of atoms in a unit cell is a whole number. For the purposes of this calculation, enter your answer to 3 significant figures.
February 4, 2008 by Thy

Science
For a cell of the CsCl type (figure 9.18), how is the length of one side of the cell,s, related to the sum of the radii of the ions, r subscript cation + r subscript anion? Figure 9.18 : i . imgur . com / zHj2SGW.png Another question : Consider the NaCl unit shell in figure 9....
December 7, 2013 by Joe

AP Chem - Science
For a cell of the CsCl type (figure 9.18), how is the length of one side of the cell,s, related to the sum of the radii of the ions, r subscript cation + r subscript anion? Figure 9.18 : i . imgur . com / zHj2SGW.png Another question : Consider the NaCl unit shell in figure 9....
December 5, 2013 by Kony

chemistry
The density of platinum is 21500 kg/m3 and the cell volume is 6.04 x 10-26 L. Determine the number of atoms in the unit cell. Note: the number of atoms in a unit cell is a whole number.
February 21, 2009 by tweety

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 rubidium has bcc packing with a body-centered cubic...
February 8, 2010 by Dan

Math please help with these word problems i have
1. The circumference of a circle is the product of the number π and twice the radius. 2. The area of a square is the square of the length of a side. 3. The perimeter of a square is four times the length of a side. 4. Force equals the product of mass and acceleration. 5. ...
July 13, 2012 by Tony

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.
October 17, 2011 by ana

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.
February 21, 2009 by tweety

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
May 12, 2010 by Anon

chemistry
Answer the following for a body centered unit cell. type of packing type of holes # atoms / 1 unit cell coordination #
February 18, 2008 by Stacy

Physics
Centrifuges are commonly used in biological laboratories for the isolation and maintenance of cell preparations. For cell separation, assume centrifugation conditions that are 1.00 x 103 rpm using an 8.16-cm-radius rotor. What is the radial acceleration of material in the ...
October 3, 2012 by Liz

chem
For a primitive cubic unit cell, r=6.0 what is the body diagonal in terms of r, the lattice pt radius
February 18, 2008 by jin

CHEM help needed
how do i find the Volume of Atoms within Unit Cell in(^3)? I think it has something to do with avogadros number but i do not know exactly...so far i know that the volume of the unit cell is 47.045881 ^3. PLEASE HELP
February 14, 2009 by jerry

general chemistry
What is the radius of the largest sphere that can be placed at the center of a face-centered cubic unit cell of a cubic closest-packed array of spheres if the spheres have radius of 2.0 x 10^2 pm?
March 24, 2013 by StressedStudent

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.
February 4, 2008 by roxanne

chemistry
Answer the following for a primitive cubic unit cell. Answers should be numerical, set r = 7.0. edge in terms of r, the lattice pt radius=? face diagonal in terms of r, the lattice pt radius=? body diagonal in terms of r, the lattice pt radius=?
February 16, 2009 by leah

Math
consider a triangle with vertices (a,b), (c,d), (e,f), with the area of the triangle b/2 a = area of an equilateral triangle with side length b c = length of diagonal of a cube with side length b a/c = the positive asymptote of the conic equation (x^2)-2(y^2)=6 d = volume of ...
December 17, 2007 by Paragon

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.
May 13, 2009 by Linda

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.
February 9, 2010 by Luc

Chemistry
Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 (femtometers) and the radius of the atom is approximately 70 (picometers). The volume of the nucleus is 8.210^−8 pm^3 And the volume of the atom is 1.410^6 pm^3 I found the ...
August 31, 2011 by Brittany

biology
What connections can you identify between the metric units for length and volume length x length x length = cubic length. That is cm x cm x cm = cubic centimeters or m x m x m = cubic meters. That is length used to measure the sides will provide a volume. That is why volume ...
September 25, 2006 by wow

chemistry
An element has ccp packing with a face-centered cubic unit cell. Its densiry is 2.70E3 kg/m3 and the unit cell volume is 6.64E-29 m3. Calculate the molar mass (g/mol) of the element to 3 significant figures.
February 4, 2008 by roxanne

chemistry
An element has ccp packing with a face-centered cubic unit cell. Its densiry is 2.70E3 kg/m3 and the unit cell volume is 6.64E-29 m3. Calculate the molar mass (g/mol) of the element to 3 significant figures.
February 4, 2008 by roxanne

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.
May 16, 2009 by Kristina

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.
May 16, 2009 by Kristina

chemistry
An element has ccp packing with a face-centered cubic unit cell. Its density is 1770 kg/m3 and the unit cell volume is 1.50 x 10-28 m3. Calculate the molar mass (g/mol) of the element to three significant figures.
January 20, 2012 by Crystal

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