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1.62 The following atomic radii have been measured by X-ray crystallography with an accuracy of 5pm. Determine the number of significant figures in the measurements of each of the following atomic radii: (a) hydrogeny.25 pm, (b) carbon/70 pm, (c) aluminum/4125 pm. (d) sulfur 100 pm, (e) zirconium/155 pm. 1.63 Determine the results for the following calculations to the correct number of significant figures: (a) 248.65 g+ 245 9. (b) 378 cm+ 2.36 cm 200 cm, (c) 469.01 kg- 33 2264 kg. (d) 271m + 1m + 16m. (e) 500 m-20m. (10.110 m-0.04m. 1.64 Determine the results for the following calculations to the correct number of significant figures, express the results in scientific notation, and give the units of the results: (a) 33.25 g/1.1mL. (b) 84m/s 25.2 5. (c) 450m/242 s. (d) 3.0 105km/s 9.3 10km, (e) 1.22 10 J/32 s. 1.65 Express the results of the following conversions in scientific notation using the correct number of significant figures: (a) 239.0 cm to km, (b) 100.6mg to g. (c)0.004 g to wg. (d) 0.75L to mL, (e) 10.5mL to L. (0)65 s to ms. 1.66 Convert each of the measurements to kg expressing each in scientific notation: (a) 1.24L to ml, (b) 2.63 og to na. (c) 3.6 10% km tom, (d) 460Tg. 1.67 Express each of the distances listed in Problem 1.59 in meters with the appropriate Si prefix. 1.68 Listed below are masses in kilograms some solar objects. Express each in scientific notation in vottaacamos. (a) 5.9736 102 (Earth). (b) 7.35 1022 (Moon) (c) 4.8685 1024 (Venus), (d) 1.8986 1027 (Jupiter). (e) 6.4185 1021 (Mars). (f) 1.9891 10% (Sun). 1.69 Calculate the density of the solar objects in Problem 1.68 using the volumes listed below in km? Express the result in petancams/km with the correct number of significant figures. (a) 1.08321 10*2 (Earth), (b) 2.1958 1010 (Moon). (c) 9.2843 10" (Venus), (d) 1.43128 101 (Jupiter). (e) 1.6318 10" (Mars). (6) 1.412 101(Sun). 1.70 Convert the densities in Problem 1.69 to g/cm using the conversion factor, 1 km %1 1015 cm 1.71 The atmospheric pressures at the surface of some solar objects are listed below in SI derived units. What are these pressures in bar? Express the results in scientific notation with the correct number of significant figures. (a) 101 kPa (Earth). (b) 800 Pa (Mars). (c) 300 pPa (Moon light). (d) 800 pPa (Moon dark). 1.72 The mean surface temperatures of some solar objects are given below in the SI base unit. What are these temperatures in degrees Celsius? (a) 220 K (Moon). (b) 210 K (Mars). (c) 737 K (Venus). 1.73 What are the temperatures listed in Problem 1.72 in degrees Fahrenheit? 1.74 An unknown solid material in the shape of a rod is measured and found to be 22.5 mm in diameter and 74cm long. The mass of the material is measured and found to be 79.45239. Calculate the density of the solid with the correct number of significant figures. 1.75 Calculate the density of an unknown liquid with a measured mass of 23.724 g and a measured volume of 30.0mL. 1.76 A laboratory experiment requires 63.2 g of the liquid in Problem 1.75. How much volume of the liquid should be measured in order to obtain the required mass? 1.77 The volume of the liquid in Problem 1.75 was measured at a temperature of 25°C. When the temperature of the liquid was increased to 50°C, the volume of the liquid increased to 31.0mL. What is the decrease in density of the liquid with this 25°C increase in temperature? 1.78 A solution is made up of table salt in water by measuring three salt samples of 1.2, 10.0, and 4.36 g. All three samples are dissolved in 100mL of water. What is the final concentration of the salt in the solution in g/mL? 1.79 What physical separation methods should be used to separate the following mixtures: (a) a homogeneous mixture of hydrogen and oxygen. (b) a heterogeneous mixture of clay and water. (c) a homogeneous mixture of ethanol in water, (d) a heterogeneous mixture of sand in water, (e) a heterogeneous mixture of proteins in ice?