Mole Test 1. How many moles are in 325 grams of iron(III) sulfate, Fe (SO ) ? 2 4 3 A. 0.467 mol B. 0.812 mol C. 1.23 mol D. 2.14 mol 2. How many grams are in 1 mole of sulfuric acid (H SO )? 2 4 –2 A. 0.01 × 10 g –2 B. 0.02 × 10 g 1 C. 4.9 × 10 g 1 D. 9.8 × 10 g 3. What is the percent by mass of sulfur in sulfur dioxide (SO )? 2 A. 25% B. 33% C. 50% D. 67% 4. Which compound has the greatest percent by mass of nitrogen? A. NH 3 B. NF 3 C. NO D. NO 2 5. Which represents an empirical formula? A. C H O 6 12 6 B. N O 2 4 C. H SO 2 4 D. P O 4 10 6. If the empirical formula for a compound is NO and its molar mass is 92 g/mol, what is 2 the molecular formula? A. NO B. NO 2 C. N O 2 3 D. N O 2 4 7. What would be the empirical formula of a compound that is 25.5% carbon, 6.40% hydrogen, and 68.1% oxygen? A. CH O 2 B. CH O 3 2 C. C H O 2 3 2 D. C HO 4 11 8. What is the percent composition of strontium (Sr) in strontium carbonate solid (SrCO (s ))? 3 A. 1.68% B. 20.0% C. 56.3% D. 59.4% 9. Carbon tetrachloride is a colorless liquid. How many molecules are present in 6.32 g of the compound? 26 A. 6.82 x 10 molecules 21 B. 1.61 x 10 molecules 22 C. 2.47 x 10 molecules 26 D. 5.85 x 10 molecules 10. What is the percentage of water present in nickel(II) chloride hexahydrate, NiCl 6H O? 2 2 A. 7.58% B. 13.9% C. 45.5% D. 83.4% 11. In an experiment, Guy gently heated a hydrated copper compound to remove the water of hydration. If the compound originally weighed 1.72 g before heating and weighed 1.12 g after heating, what was the percentage of water in the compound? A. 34.9% B. 46.5% C. 53.5% D. 65.1% 12. How many moles of CO are present in a volume of 1.00 L at STP? A. 0.0446 mol B. 0.224 mol C. 22.4 mol D. 28.0 mol 13. What volume would a 10.0 mole sample of helium gas occupy at STP? A. 0.446 L B. 4.46 L C. 2.24 L D. 224 L 14. Analysis of a 50g sample of an unknown compound shows that it contains 6.9 g of potassium, 9.2 g of chromium, 11.3 g of sulfur, and 22.6 g of oxygen. What would be the empirical formula for this compound? A. KCrSO B. KCrS O 2 8 C. K Cr S O 2 2 3 14 D. K Cr S O 7 9 11 23 15. What is the molar mass of vitamin A, a fatsoluble vitamin? The molecular formula of vitamin A is C H O. 20 30 A. 29 g/mol B. 51 g/mol C. 270 g/mol D. 286 g/mol 16. How many oxygen atoms are contained in 0.1 mole of iron (III) oxide, Fe O ? 2 3 21 A. 6.022 × 10 atoms 22 B. 6.022 × 10 atoms 23 C. 1.807 × 10 atoms 24 D. 1.807 × 10 atoms 17. What is mass of 3.0 moles of nitrogen gas at STP? A. 14 g B. 28 g C. 42 g D. 84 g 18. What is the percent composition of oxygen in calcium nitrate, Ca(NO ) ? 3 2 A. 29.3% B. 43.6% C. 58.5% D. 87.2% 19. How many atoms are present in a 6.00 mol sample of silver? 25 A. 2.76 x 10 atoms 3 B. 9.27 x 10 atoms 2 C. 1.08 x 10 atoms 24 D. 3.61 x 10 atoms 6 20. How many moles are in 2.0 x 10 atoms of carbon? 19 A. 2.8 x 10 mol 18 B. 3.3 x 10 mol 17 C. 3.0 x 10 mol 18 D. 3.6 x 10 mol 21. Which of the following electron configurations represents an alkaline earth metal? 2 A. [Ar] 4s 2 3 B. [Ar] 4s 3d 1 C. [Ar] 4s 10 2 D. [Ar] 3d 4s 22. Which of the following is false about the molecule above? A. As a liquid, It is soluble in water B. It has a tetrahedral shape C. It has a low boiling point D. The IUPAC name is carbon tetrahydride 23. Which element in group 15 has the greatest metallic character? A. N B. P C. Sb D. Bi 24. Which energy level would contain electrons with the lowest energy? A. n=1 B. n=2 C. n=5 D. n=7 Question Answer Standard 1 B NCES.9_12.SC.CH.2.2.5 2 D NCES.9_12.SC.CH.2.2.5 3 C NCES.9_12.SC.CH.2.2.5 4 A NCES.9_12.SC.CH.2.2.5 5 C NCES.9_12.SC.CH.2.2.5 6 D NCES.9_12.SC.CH.2.2.5 7 B NCES.9_12.SC.CH.2.2.5 8 D NCES.9_12.SC.CH.2.2.5 9 C NCES.9_12.SC.CH.2.2.5 10 C NCES.9_12.SC.CH.2.2.5 11 A NCES.9_12.SC.CH.2.2.5 12 A NCES.9_12.SC.CH.2.2.5 13 D NCES.9_12.SC.CH.2.2.5 14 B NCES.9_12.SC.CH.2.2.5 15 D NCES.9_12.SC.CH.2.2.5 16 C NCES.9_12.SC.CH.2.2.5 17 D NCES.9_12.SC.CH.2.2.5 18 C NCES.9_12.SC.CH.2.2.5 19 D NCES.9_12.SC.CH.2.2.5 20 B NCES.9_12.SC.CH.2.2.5 21 A NCES.9_12.SC.CH.1.3.2 22 A NCES.9_12.SC.CH.1.2.5 24 D NCES.9_12.SC.CH.1.3.1 25 A NCES.9_12.SC.CH.1.1.3
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