SOLVE STEP BY STEP IN DIGITAL FORMAT Structure of Metal Materials: 8. A colleague calculated the density of iron with BCC structure using the following data of atomic radius equal to 1.24 Angstrom and atomic weight of 55.85 as follows: p = [(4 atoms/C. U.) x (55.85 g/atomic weight) / (atoms/atomic weight) / [2(1.24x108 cm)/√2]³ p = 68.8 g/cm³

SOLVE STEP BY STEP IN DIGITAL FORMAT Structure of Metal Materials: 8. A colleague calculated the density of iron with BCC structure using the following data of atomic radius equal to 1.24 Angstrom and atomic weight of 55.85 as follows: p = [(4 atoms/C. U.) x (55.85 g/atomic weight) / (atoms/atomic weight) / [2(1.24x108 cm)/√2]³ p = 68.8 g/cm³

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter2: Atoms And Molecules

Section: Chapter Questions

Problem 2.95PAE: 2.95 Engineers who design bicycle frames are familiar with the densities of aluminium (2.699 g/cm3),...

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2.95 Engineers who design bicycle frames are familiar with the densities of aluminium (2.699 g/cm3), steel (7.87 g/cm3), and titanium (4.507 g/cm3). How does this information compare with Figure 2.12, and what would it suggest for changes in this figure if more shades were used for the density colour-coding? (Iron is the principal component of steel)
The main weapon on a military tank is a cannon that fires a blunt projectile specially designed to cause a shock wave when it hits another tank. The projectile fits into a finned casing that improves its accuracy. Calculate the mass of the projectile, assuming it is a cylinder of uranium (density = 19.05 g/cm3) that is 105 mm in diameter and 30 cm in height. The volume of a cylinder is given by the equation V = r2h
On October 21, 1982, the Bureau of the Mint changed the composition of pennies (see Exercise 120). Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2% Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by mass. Does this account for the difference in mass among die pennies in Exercise 120? Assume the volume of the individual metals that make up each penny can be added together to give the overall volume of the penny, and assume each penny is the same size. (Density of Cu = 8.96 g/cm3; density of Zn = 7.14 g/cm3).
The density of aluminum is 2.7 g/cm3; that of silicon is 2.3 g/cm3. Explain why Si has the lower density even though it has heavier atoms.
5.6 x 1012 is ... * Small than 1 O Larger than 1 60,900,000 is equal to * 6.9 x 10° 6.09 x 106 O 6.09 x 107 O 6.9 x 107
Gold has 79 electrons per atom and an atomic mass of 197 u. Part A What is the total charge of all the electrons in 3.1-kg bar of gold? Express your answer to two significant figures and include the appropriate units. µA a xa х.10п b Qtotal = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Check your signs. Part B What is the net charge of the bar? Express your answer with the appropriate units. Qnet = Value Units Submit Request Answer
Am I right? Calculate the mass percentage of water in the hydrate. Show the calculations. Sample 1 : 60.87% Mass of hydrate : 0.46g Mas of water : 0.28g Mass percentage of water in the hydrate = 0.28g/0.46g x 100 = 60.87% Sample 1 2 3 Calculations for sample 1 Mass of aluminum dish 1.24g 1.26g 1.24g - Mass of aluminum dish + Epsom salt 1.70g 1.94g 1.80g - Epsom salt, original (hydrated) mass 0.46g 0.68g 0.56g 1.70g – 1.24g = 0.46g Mass of aluminum dish + Epsom salt after heating 1.42g 1.62g 1.61g Epsom salt, heated (dehydrated) mass 0.18g 0.36g 0.37g 1.42g- 1.24g = 0.18g Mass of water 0.28g 0.32g 0.19g 0.46g – 0.18g = 0.28g Moles of magnesium sulfate 0.0015mol 0.0030mol 0.0031mol 0.18g x (1mol/120.37g)= 0.0015mol Moles of water 0.016mol 0.018mol 0.011mol 0.28g x (1mol/18.02g) = 0.016mol Ratio of moles water: moles of magnesium sulfate 32:3 18:3 11:3.1…
Assuming that a lithium atom is spherical, calculate its volume in cm3. The volume of a sphere is given by V=(4/3)3.14r3. The diameter of a lithium atom is 104 Å.
The mass of magnesium used in this experiment is critical to determining the moles of hydrogen gas generated. The analytical balances used in Chemistry 1A labs are very sensitive to point that touching materials with your fingers before measuring them can affect the measurements. The balances are sensitive enough to detect dirt and oils from your fingers transferred to the magnesium. Would your experimental value of R increase or decrease if the mass of magnesium measured was artificially high due the touching it with your hands? Increase Decrease
2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the volume and then several minutes later you measure the mass of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.]
(0.0050 x 28000.0) + (2819 × 15) Express your answer to the appropriate number of significant digits. να ΑΣφ ? (0.0050 x 28000.0) + (2819 × 15) = Submit Previous Answers Request Answer X Incorrect; Try Again; One attempt remaining Part D 861 x [1255 – (3.65 x 101)] Express your answer to the appropriate number of significant digits. ? 861 x [1255 – (3.65 x 101)] = Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining
7. 22 This question is about several salts. (a) A hydrated salt, compound A, is analysed and has the following percentage composition by mass: Cr, 19.51%; CI, 39.96%; H, 4.51%; O, 36.02%. Calculate the formula of compound A, showing clearly the water of crystallisation. Show your working. formula of compound A = (b) A student carries out an experiment to determine the amount of water of crystallisation in the formula of another hydrated salt. The student intends to remove the water by heating the hydrated salt. A diagram of the apparatus used by the student is shown below. crucible pipeclay triangie The student adds the hydrated salt to the crucible and weighs the crucible and contents. The student heats the crucible and contents and allows them to cool. The student weighs the crucible and residue. The student's results are shown below. 16,84 Mass of crucible + hydrated salt/g 16.26 Mass of crucible + residue after heating/g