Moles Quiz I say atom you say amu

Moles Quiz I say atom, you say amu What are you made of? Need a mole? Just call 6021023 How big is that piece of pie? Is it Really that easy? 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5

Calculate the mass (amu) of a sample that contains 23 nitrogen atoms. 322. 2 amu

Calculate the number of oxygen atoms in a sample that has a mass of 288 amu. 18. 0 atoms

Calculate the mass (in amu) of a sample of Bromine that has the same number of atoms as a 343 amu sample of Calcium. 684 amu

Calculate the number of atoms in a 5. 321 amu sample of molybdenum. 5. 546 x 10 -2 atoms

How many grams is 1 amu? 1. 66 x 10 -24 g

What is the percent composition of the elements found in carbon tetrafluoride? 13. 65% C and 86. 35%F

What is the percent composition of the elements in Cu. Cl 2? 47. 27%Cu and 52. 73% Cl

What is the mass percent of chlorine in sodium chloride? 39. 34%Na and 60. 66% Cl

What is the mass percent of the anion in calcium hydroxide? 45. 91%

The percentage of sulfur in sulfur dioxide is about 50%. What is the percentage of oxygen in this compound? About 50%

Calculate both the number of moles and the mass of a sample of chromium containing 5. 00 x 1020 atoms. 8. 30 x 10 -4 mol and 4. 32 x 10 -2 grams

Calculate the number of moles in a 57. 7 g sample of sulfur. 1. 80 mol

Which weighs more, 0. 50 mol of oxygen or 4 mol of hydrogen atoms? . 50 mol of Oxygen

Calculate the number of grams of iron that contains the same number of atoms as 2. 24 g of cobalt. 2. 12 g Fe

How many atoms are present in a 3. 57 kg sample of aluminum? 7. 97 x 1025 atoms

A single molecule of a particular compound has a mass of 4. 65 x 10 -23 g. Which of the following could be this compound? A. NO 2 B. CO C. Water D. Ammonia B.

What is the percent by mass of carbon in table sugar, C 12 H 22 O 11 42%

Calculate the molar mass for magnesium sulfate. 120. 38 g

Calculate the number of units of teflon (C 2 H 4) in 135 g. 2. 90 x 1024

Compute the mass percent of each element in the formula for penicillin F (C 14 H 2 ON 2 SO 4) C 53. 81% H 6. 453% N 8. 969% S 10. 27% O 20. 49%

A particular compound in the chemistry lab is found to contain 7. 2 x 1024 atoms of oxygen, 56. 0 g of Nitrogen, and 4. 0 mol of hydrogen. What is this compound’s empirical formula? HNO 3

What is the empirical formula of a compound that is 31. 9% potassium, 28. 9% chlorine, and 39. 2% oxygen? KCl. O 3

A compound contains 259. 2 grams of F and 40. 8 grams of C. What is the empirical formula of this compound? CF 4

A compound’s empirical formula is HO. If the formula mass is 34 grams, what is the molecular formula? H 2 O 2

Which of the following does not have the corresponding empirical formula XY 2 Z? a. b. c. d. X 2 Y 4 Z 2 XYZ X 6 Y 12 Z 6 X 3 Y 6 Z 3 B