61) How many cm are in 24.2 ft? A) 9.53 cm B) 290 cm C) 61.5 cm D) 738 cm E) 0.794 cm 62) Which of the following contains the most atoms? You shouldn’t need to do a calculation here. A) 10.0 g Al B) 10.0 g He C) 10.0 g Ca D) 10.0 g Kr E) 10.0 g Cs 63) Which of the following contains the fewest atoms? You shouldn’t need to do a calculation here. A) 10.0 g Mg B) 10.0 g Li C) 10.0 g Ca D) 10.0 g Rb E) 10.0 g Cs 64) How many Zn atoms are contained in 922 g of Zn? A) 5.90 × 1025 Zn atoms B) 7.09 × 1021 Zn atoms C) 8.49 × 1024 Zn atoms D) 4.27 × 1022 Zn atoms E) 4.18 × 1024 Zn atoms 65) Calculate the mass (in g) of 2.0 × 1024 atoms of Hg. A) 3.9 × 102 g B) 2.4 × 102 g C) 3.2 × 102 g D) 1.5 × 102 g E) 6.5 × 102 g 66) How many magnesium atoms are contained in 3.75 moles of magnesium? A) 1.23 × 1024 magnesium atoms B) 2.26 × 1024 magnesium atoms C) 1.61 × 1023 magnesium atoms D) 5.48 × 1025 magnesium atoms E) 6.50 × 1025 magnesium atoms 67) What mass (in g) does 7.98 moles of Kr have? A) 668 g B) 952 g C) 422 g D) 480 g E) 288 g 68) How many moles of potassium are contained in 150 g of potassium? A) 3.83 moles B) 0.720 moles C) 10.0 moles D) 7.90 moles E) 4.85 moles 69) How many moles are in 2.16 × 1024 atoms of lead? A) 35.9 moles B) 3.59 moles C) 0.359 moles D) 6.08 moles E) 1.79 moles 70) How many atoms are in 2.50 moles of SiO2? A) 4.52 × 1024 atoms B) 1.52 × 1024 atoms C) 5.02 × 1023 atoms D) 3.01 × 1024 atoms E) 7.53 × 1023 atoms 71) How many molecules are in 2.50 moles of SiO2? A) 4.52 × 1024 atoms B) 1.51 × 1024 atoms C) 5.02 × 1023 atoms D) 3.01 × 1024 atoms E) 7.53 × 1023 atoms 72) How many atoms of carbon are in 2.50 moles of CO2? A) 4.52 × 1024 atoms B) 1.51 × 1024 atoms C) 5.02 × 1023 atoms D) 3.01 × 1024 atoms E) 7.53 × 1023 atoms 73) How many atoms of oxygen are in 2.50 moles of SO2? A) 4.52 × 1024 atoms B) 1.51 × 1024 atoms C) 5.02 × 1023 atoms D) 3.01 × 1024 atoms E) 7.53 × 1023 atoms 74) What mass (in kg) does 4.77 moles of nickel have? A) 0.352 kg B) 0.122 kg C) 0.820 kg D) 0.280 kg E) 0.632 kg