Gallium consists of two isotopes of masses 68.95amu and 70.95amu with abundance of 60.16% and 39.84%, respectively. What is the average atomic mass of gallium? ( Ans: ca. 69.75) Naturally occurring cupper exists in two isotopic forms: 63Cu and 65Cu. The atomic mass of copper is 63.55amu. What is the approximate abundance of 63Cu? (Ans: […]
1. Zinc and sulfur react to form zinc sulfide according to the following eqn. 8 Zn(s) + S8(s) –à 8 ZnS If 2.00 mol of Zn are heated with 1.00 mol of S8, identify the limiting reagent. How many moles of excess reactant remain How many moles of the product are formed? 2. Carbon reacts […]
1. Given the balanced equation: 2 C4H10(g) + 13 O2 (g) 8 CO2 (g) + 10 H2 O(g) What is the total number of moles of O2 (g) that must react completely with 5.00 moles of C4H10(g )? 10.0 20.0 26.5 32.5 2. Which equation is correctly balanced? H2 + O2 H2O Ca + Cl2 CaCl […]
NAME CHEM FORMULA POLYATOMIC IONS NITRATE PHOSPHATE CARBONATE SULFATE NITRITE PHOSPHITE SULFITE CHLORATE CHLORITE HYPOCHLORITE PERCHLORATE HYDROXIDE CYANIDE ACETATE AMMONIUM HYDRONIUM DICHROMATE NAMING TYPE I 1 Calcium Phosphate 2 Sodium Nitrate 3 Sodium Hydroxide 4 Cesium Oxide 5 Aluminum Hydroxide 6 Beryllium Chloride 7 Magnesium Sulfide 8 Barium Sulfate NAME CHEM FORMULA 9 Potassium Dichromate […]