1. Quiz February 23 1.Find the atomic mass of Al. 2.Find the gram formula mass of Cu 2 O. 3.Underline the important information in the stoichiometry problem below: 10 g of copper (I) oxide, Cu 2 O, reacts with hydrogen to produce copper metal and water. How many grams of copper are produced. Cu 2 O + H 2 → 2 Cu + H 2 O 4.Copy the equation and put as much info as you can under the equation. 27 g (5pts) 2 x 64 = 128 + 16 = 144 g/mole (2.5 pts) (2.5 pts) (5 pts) Cu 2 O + H 2 → 2 Cu + H 2 O 10 g ?g (5 pts)

2. 15 g of copper (II) oxide, CuO, reacts with hydrogen to produce copper metal and water. How many grams of copper are produced. Cu 2 O + H 2 → 2 Cu + H 2 O 15 g?g 2Cu = 2x 64 = 128 O = 16 144g/mole  144g/mole 0.104 mole 1 0.208 mole x 64 g/mole = 13.3 g Cu 2

3. 29. Ammonia is synthesized from hydrogen and nitrogen according to the following equation: N 2 + 3 H 2 → 2NH 3 If an excess of nitrogen is reacted with 3.41 g of hydrogen, how many grams of ammonia can be produced. N 2 + 3 H 2 → 2 NH 3 3.41 g ?g 2 g/mole H 2 1.7mole 32 1.14 mole N = 14 3H = 3 17 g/mole x 17g/mole = 19.3 g

4. 30. Assume that in the decomposition of potassium chlorate, KClO 3, 80.5 g of O 2 form. How many grams of potassium chloride the other product forms. KClO 3 K + Cl - + O 2 32 2 80.5 g?g 32 g/mole 2.52 mole 1.68 mole K =39 Cl = 35 74g/mole x 74 g/mole 124 g = 3 2

5. 31. In a single displacement reaction, 9.23 g of aluminum react with excess hydrochloric acid. How many grams of hydrogen will be produced? Al+HCl  H2H2 + Al 3+ Cl 1- + AlCl 3 6322 9.23 g? g  27g/mole 0.34 mole 0.51 mole 2 g/mole 2 H= 2x1 = 2 = 1.03 g 23

6. Finish the Following for homework #32 p and 59,60 page 245 32. The compound “cisplatin” PtCl 2 (NH 3 ) 2, has been found to be effective in treating some types of cancer. It can be synthesized using the reaction on page 237 of your book. a) How much “cisplatin” can be produced from 2.50 g PtCl 2 (NH 3 ) 2 and excess NH 3. ? b) How much NH 3 is needed? 59. In the decomposition of sodium chlorate, 31.7 g of oxygen are formed. How many grams of sodium chloride are produced? NaClO 3 -> NaCl + O 2 (unbalanced reaction) 60. The action of carbon monoxide on iron (III) oxide can be represented by Fe 2 O 3 + 3 CO -> 2 Fe + 3 CO 2. How much carbon monoxide is used if 57.5 g of iron were produced?