11. How many moles of oxygen atoms are there in 10 moles of KCIOs? A) 3 mol B) 3

Question

11. How many moles of oxygen atoms are there in 10 moles of KCIOs? A) 3 mol B) 3.3 mol C) 10 mol D) 30 mol E) 6.02 x 104 mol 10 12. What is the mass of 8.25 x 1019 UFe molecules? A) 352 g B) 0,0482 g C). I:37 x10-g D290 x10ng E) 8.25 x10198 13. One way of obtaining pure sodium carbonate is through the decomposition of theo mineral trona, Nas(COs) (HCO)-2H:O, as shown in the following reaction:esa 2Na(co,)(HCO)2H20(s) 3Na2co,(s) + CO2(g) + 5H20(g) When 15 metric ton (1 x 10' kg) of trona is decomposed, 11 metric ton of NaCo is recovered. What is the percent yield of this reaction? (1 metric ton-10' kg) A) 95% B) 73% C) 65% D) 42% E) 13% 14. When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? A) 42 B) 21 C) 11 D) 10 E) none of these 15. Determine the number of moles of aluminum in 96.7 g of Al. A) 0.279 mol B) 3.58 mol C) 7.43 mol D) 4.21 mol E) 6.02 x 108 mol 16. The diameter of Earth is 12.7 Mm. Express this diameter in centimeters A) 1.27x 103 em B) 1.27 x 10% cm C) 1.27 x 10 cm D) E) 1.27x 109 cm 1.27x 10° cm 17. Which of the following represents the largest mass? D) E) 2.0 x 102 cg 10.0 dg A) B) 2.0×102 mg 0.0010 kg 1.0×105 ng C) 18. The highest temperature ever recorded in Phoenix, Arizona, was 122°F. Express this temperature in °C. A) 50.0°C B) 64.4°C C) 67.8°C D) 162.0°C E) 219.6°C 19. The density of mercury is 13,6 g/em. What volume (in quarts) is occupied by 100.g ofHig? (1 L= 1.06 qt) A) 144qt B) 7.35 qt C) 7.79 qt D) 7.79 x 10-3 qt E) 1.44x 10-4q 20. An oxide ion, O-, has: A) B) C) 8 protons and 10 electrons 10 protons and 8 electrons 8 protons and 9 electrons D) E) 8 protons and 7 electrons 10 protons and 7 electrons

Explanation / Answer

Ans 11 : D) 30 mol

Each mole of KClO3 has 3 mol of oxygen atoms.

So 10 mole of KClO3 compound will have 3 x 10 = 30 mol of oxygen atoms.

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