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The density of lithium metal is
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Chemistry
- 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).arrow_forward2.97 LDPE has a density in the range of 0.915—0.935 g/cm3, and HDPF has a density in the range of 0.940—0.965 g/cm3. You receive a small disk, 2.0 cm high with a 6.0-cm diameter, from a manufacturer of polyethylene, but its label is missing. You measure the mass of the disk and find that it is 53.8 g. Is the material HDPE or LDPE?arrow_forward3.37 If atypical grain of sand occupies a volume of 1.3 × 10-4 cm3, what is the volume (in cm3) of 1 mole of sand (ignoring the space between grains)? What is the volume in liters?arrow_forward
- Gold leaf, which is used for many decorative purposes, is made by hammering pure gold into very thin sheets. Assuming that a sheet of gold leaf is 1.27 105 cm thick, how many square feet of gold leaf could be obtained from 28.35 g gold? The density of gold is 19.3 g/cm3.arrow_forwardAn aluminum cylinder is 0.512 ft in length and has a diameter of 0.3142 inch. The density of aluminum is 2.70 g / cc. MW of aluminum is 26.981538. What is the volume of the aluminum cylinder in cm3? What is the mass of the aluminum cylinder in g? Calculate the number of aluminum atoms present in the cylinder?arrow_forwardThe radius of cesium atom, Cs, 1s 265 pm, and its mass is 2.21 x 10 22 g. What is the density of the atom in grams per cubic centimeter (g/cm')? Assume the nucleus is a sphere with volume, V = 3. (1 pm = 1×10-12 m).arrow_forward
- What is the mass of a piece of silver metal that has a volume of 17.4 cm^3? (The density of silver metal is 10.5 g/cm^3.)arrow_forwardSuppose now that you wanted to determine the density of a small crystal to confirm that it is sulfur. From the literature, you know that sulfur has a density of 2.07 g/cm³. How would you prepare 20.0 mL of the liquid mixture having that density from pure samples of CHCI3 (d = 1.492 g/mL) and CHBR3 (d= 2.890 g/mL)? (Note: 1 mL 1 cm³) V(CHCI3) = mL V(CHB13) = mLarrow_forwardThe density of copper is 8.96g/cm^3. What is the mass in mg of a cube of copper that measures 2.31 mm on each side? a) 0.0207g b) 0.110 g c) 2.07 g d) 110 garrow_forward
- 7. The density of aluminum is 2.702 g/cm³. What is the final liquid level of water if 1.130 ounces of aluminum is dropped into a graduated cylinder containing 15.90 mL of water? (1 ounce = 28.3 g) A) 21.66 mL B) 17.08 mL C) 27.76 mL D) 47.95 mLarrow_forwardEarth’s surface area is 5.1 x 108 km2, its crust has an average thickness of 35 km and an average density of 2.8 g/cm3. The two rarest (non-radioactive) elements in the crust are ruthenium and rhodium, each with an abundance of 1.0 x 10-4g/metric ton crust. What is the total mass of these two elements in the earth’s crust? (1g = 1 x 10-6 metric ton)arrow_forwardThe radius of an atom of gold (Au) is about 1.35 Å. Part A: Express this distance in nanometers (nm). Express your answer using three significant figures. Part B: Express this distance in picometers (pm). Express your answer using three significant figures. Part C: How many gold atoms would have to be lined up to span 9.5 mm? Express your answer using two significant figures. Part D: If the atom is assumed to be a sphere, what is the volume in cm3 of a single Au atom? Express your answer using three significant figures.arrow_forward
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