45. In an s orbital, the probability of finding an electron a particular distance from the nucleus does NOT on a. a quan

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45. In an s orbital, the probability of finding an electron a particular distance from the nucleus does NOT on a. a quantum mechanical model c. the Schrodinger cquation b. direction with respect to the nucleus d. the electron energy sublevel 46. How many hydrogen atoms are in 5 molecules of isopropyl alcohol, C3​H2​O ? a. 5×(6.02×1023) c. 35 b. 5 d. 35×(6.02×1023) 47. How many moles of tungsten atoms are in 4.8×1025 atoms of tungsten? a. 8.0×102 moles c. 1.3×10−1 moles b. 8.0×101 moles d. 1.3×10−2 moles 48. How many atoms are in 0.075 mol of titanium? a. 1,2×103 c. 6.4×102 b. 2.2×1024 d. 4.5×1022 49. Butanol is composed of carbon. hydrogen, and oxygen. If 1.0 mol of butanol contains 6.0×1024 atoms of hydrogen, what is the subscript for the hydrogen atom in C4​H2​O ? ta. 1 c. 6 b. 10 di​8 50. Which of the following is NOT a true about atomic mass? ถ. The atomic mass is 12 g for magnesium. b. The atomic mass is the mass of one mole of atoms. e. The atomic mass is found by checking the periodic table. d. The atomic mass is the number of grams of an element that is numerically equal to the mass in amt.
51. What is true about the molar mass of chlorine gas? a. The molar mass is 35.5 g. b. The molar mass is 71.0 g. c. The molar mass is equal to the mass of one mole of chlorine atoms. d. none of the above 52. What is the molar mass of (NH4​)2​CO3​ ? a. 144 g c. 96 g b. 138 g d. 78 g 53. What is the number of moles in 432 gBa(NO3​)2​ ? a. 0.237 mol c. 1.65 mol b. 0.605 mol d. 3.66 mol 54. What is the number of moles of beryllium atoms in 36 g of Be? a. 0.25 mol c. 45.0 mol b. 4.0 mol d. 320 mol
55. How many moles of CaBr2​ are in 5.0grams of CaBr2​ ? a. 2.5×10−2 mol c. 4.0×10′mol b. 4.2×10−2 mol d. 1.0×103 mol 56. For which of the following conversions does the value of the conversion factor depend upon the substance? a. volume of gas (STP) to moles b. density of gas (STP) to molar mass c. mass of any substance to moles d. moles of any substance to number of particles 57. What is the mass of silver in 3.4 gAgNO3​ ? a. 0.025 g c. 2.2 g b. 0.64 g d. 3.0 g 58. What is the mass of oxygen in 250 g of sulfuric acid, H2​SO4​ ? a. 0.65 g c. 16 g b. 3.9 g d. 160 g 59. The molar mass of a gas can be determined from which of the following? a. the density of the gas at STP e. Avogadro's number b. the volume of a mole of the gas d. none of the above 60. What is the number of moles in 500 L of He gas at STP? a. 0.05 mol c. 22 mol b. 0.2 mol d. 90 mol 61. The molar mass of a certain gas is 49 g. What is the density of the gas in g/L at STP? a. 3.6×10−24 g/L c. 2.2 g/L b. 0.46 g/L d. 71 g/L
61. The molar mass of a certain gas is 49 g. What is the density of the gas in g/L at STP? a. 3.6×10−74 g/L b. 0.46 g/L c. 2.2 g/L d. 71 g/L. 62. Given 1.00 mole of each of the following gases at STP. which gas would have the greatest volume? a. He c. SO3​ b. O2​ d. All would have the same volume. 63. To determine the formula of a new substance, one of the first steps is to find the a. molar mass b. percent composition c. volume at STP d. number of particles per mole 64. What information is needed to calculate the percent composition of a compound? a. the weight of the sample to be analyred and its density b. the weight of the sample to be analyred and its molar volume c. the formula of the compound and the atomic mass of its elements d. the formula of the compound and its density
65. If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound, what is the percent composition of Hgg​ in the compound? a. 28.5% b. 39.9% c. 71.5% d. 60.15% 66. 1120.0 grams of Ca combines completely with 16.0 grams of S to form a compound, what is the percent composition of Ca in the compound? a. 1.25% b. 20,0% c. 44,4% d. 55.696 67. What is the percent by mass of carbon in acetone, C3​H6​O ? a. 20.7% c. 1.61\% b. 62.1\% d. 30.0 m 68. Which expression represents the pereent by mass of nitrogen in NH4​NO3​ ? a. 14 gN/80 gNH4​NO3​×1005 c. 80 gNH,NO2​/14 g N×100% b. 28 g N/80 gNHNO4​×100h6 d. 80 gNiN4​NO3​/28 g N×100% 69. Which of the following compounds has the lowest percent gold content by weight? a. AuOH c. AuCln​ h. Nu(OH) d. Aul, 70. Which of the following compounds has the highest oxygen content, by weight? a. NaO c. BaO b. CO3​ d. H2​O 71. Which of the following is NOT an empirical formula? a. C2​ Nj​Hk​ c. BeCr2​O7​ b. C,H,O d. Sb1​ S,