Test 3 Formula and math of formula review. 2. The oxide of metal X has the formula XO. Which group in the Periodic Table contains metal X?

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1 Name: Sunday, November 04, 2007 Test 3 Formula and math of formula review 1. Which is an example of a binary compound? 1. acetic acid 3. potassium hydroxide 2. nitric acid 4. potassium oxide 2. The oxide of metal X has the formula XO. Which group in the Periodic Table contains metal X? 1. Group 1 3. Group Group 2 4. Group The name of the compound KClO is potassium 2 1. hypochlorite 3. chlorate 2. chlorite 4. perchlorate 4. Which is a formula of a binary compound? 1. BaSO 3. MgCl BiPO 4. Mg(ClO) Which is the correct formula for carbon (II) oxide? 1. CO 3. C 2 O 2. CO 2 4. C2O3

2 6. What is the formula for sodium oxalate? 1. NaClO 3. Na C O Na O 4. NaC H O Which formula represents a binary compound? 1. Ne 3. C 3 H 8 2. Br 2 4. H2SO4 8. The chemical formula for nickel (II) bromide is 1. Ni2Br 3. N2Br 2. NiBr 2 4. NBr2 9. Which element can form a chloride with a general formula of MCl or MCl? Fe 3. Mg 2. Al 4. Zn 10. The number of atoms in a molecule of helium is

3 11. Which element is found in both potassium chlorate and zinc nitrate? 1. hydrogen 3. potassium 2. oxygen 4. zinc 12. What is the correct formula for iron (III) phosphate? 1. FeP 3. FePO 4 2. Fe P 4. Fe (PO ) The correct formula for calcium phosphate is 1. CaPO 3. Ca P Ca (PO ) 4. Ca (PO ) What is the correct formula for chromium (III) oxide? 1. CrO 3 3. Cr2O3 2. Cr3O 4. Cr3O2 15. Which formula represents a binary compound? 1. NH NO 3. CH COCH CH 4. CaCO 4 3

4 16. What is the correct IUPAC name for the compound NH Cl? 4 1. nitrogen chloride 3. ammonium chloride 2. nitrogen chlorate 4. ammonium chlorate 17. What is the chemical formula for copper (II) hydroxide? 1. CuOH 3. Cu 2(OH) 2. CuOH 2 4. Cu(OH) Which formula represents lead (II) phosphate? 1. PbPO 3. Pb (PO ) Pb PO 4. Pb (PO ) Which pair of compounds has the same empirical formula? 1. C2H 2 and C6H 6 3. CH3OH and C2H5OH 2. C2H 6 and C3H 8 4. CH3CHO and CH3COOH 20. What is the molecular formula of a compound with the empirical formula P 2O 5 and a gram-molecular mass of 284 grams? 1. P2O 5 3. P10O4 2. P5O 2 4. P4O10

5 21. Which formula is an empirical formula? 1. C H 3. H O C H 4. H O What is the empirical formula for the compound C H O? CH O 3. C H O C H O 4. C H O Vitamin C has an empirical formula of C3H4O 3 and a molecular mass of 176. What is the molecular formula of Vitamin C? 1. C3H4O 3 3. C9H12O9 2. C6H8O 6 4. C10H8O3 24. What is the empirical formula of the compound whose molecular formula is P O? PO 3. P 2 O 5 2. PO 2 4. P8O Which is an empirical formula? 1. P2O 5 3. C2H4 2. P4O 6 4. C3H6

6 26. An example of an empirical formula is 1. C H 3. HC H O C H O 4. CH O Which pair of formulas correctly represents a molecular formula and its corresponding empirical formula? 1. C2H 2 and CH 3. C4H 6 and CH 2. C3H 4 and CH 2 4. C5H 8 and C2H2 28. What is the molecular formula of a compound that has a molecular mass of 54 and the empirical formula C H? C2H 3 3. C6H9 2. C4H 6 4. C8H Which substance has the same molecular and empirical formulas? 1. C6H 4 3. CH4 2. C2H 4 4. C6H12O One mole of which substance contains a total of atoms? 1. Li 3. O 2 2. NH 4. CO 3 2

7 31. What is the gram-formula mass of (NH ) CO? Use atomic masses rounded to the nearest whole number g 32. What is the total mass of oxygen in 1.00 mole of Al (CrO )? g g g g 33. What is the percent by mass of sulfur in sulfur dioxide? Which quantity is equivalent to 39 grams of LiF? mole mole mole mole 35. What is the percent by mass of oxygen in Fe O (formula mass = 160)? % 3. 56% % %

8 36. What is the gram formula mass of (NH ) PO? g g g g 37. What is the total number of hydrogen atoms required to form one molecule of C H (OH)? What is the total number of atoms of oxygen in the formula Al(ClO ) 6H O? What is the total number of moles of atoms present in 1 mole of Ca (PO )? The percent by mass of calcium in the compound calcium sulfate (CaSO ) is approximately % 3. 34% 2. 29% 4. 47%

9 41. What is the percent by mass of oxygen in magnesium oxide, MgO? 1. 20% 3. 50% 2. 40% 4. 60% 42. A hydrated salt is a solid that includes water molecules within its crystal structure. A student heated a 9.10-gram sample of a hydrated salt to a constant mass of 5.41 grams. What percent by mass of water did the salt contain? % % % % 43. What is the total number of moles of oxygen atoms present in one mole of Mg(ClO )? What is the gram formula mass of (NH ) SO? g g g g

10 45. The percent by mass of water in BaCl H O (formula mass = 243) is equal to The density of a gas is 0.77 gram per liter at STP. What is the formula mass of the gas? g g g g 47. What is the empirical formula of a compound consisting of 29.6% oxygen and 70.4% fluorine by mass? 1. OF 3. O 2 F 2. OF 2 4. O2F4 48. A compound contains 53% Al and 47% O by mass. What is the empirical formula of the compound? 1. AlO 3. Al 2 O 3 2. AlO 2 4. Al3O2

11 49. Which quantity represents mole at STP? liters of nitrogen grams of oxygen liters of oxygen grams of nitrogen 50. A compound in 86% carbon and 14% hydrogen by mass. What is the empirical formula for this compound? 1. CH 3. CH 3 2. CH 2 4. CH4

12 Answer Key for Test 3 Formula and math of formula review

13 Test 3 Formula and math of formula review

1. P 2 O 5 2. P 5 O 2 3. P 10 O 4 4. P 4 O 10

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