2.90 grams of phosphorus is burned in the presence of oxygen and forms 5.14 grams of a phosphorus oxide. What is the emperical formula of the phosphorus oxide formed? Then write a balanced equation for the formation of the phosphorus oxide.

1) Methane (CH4) combusts in oxygen to yield gaseous carbon dioxide and water vapor. Write the balanced reaction. If 65.2 mg of methane reacts with excess oxygen, determine the mass of water vapor that will be produced. Show all calculations and units. 2) Iz is produced by the reaction of 2.68 g of potassium iodide according to the following equation: 2CuCl2 + 4KI --> 2Cul2 +4KCI + I2. What is the theoretical yield (in g) of I2 from this process assuming excess copper (II) chloride? 3) lodine is unstable in its elemental form, therefore it is often prepared from an iodide and an iodate salt according to the following equation: 103- + 51- + 6H+ → 312 + 3 H2O. How many grams of the iodide ion (1-) are required to prepare 15 g of H2O? 4) Describe the difference between the limiting and excess reagents (in your own words). If given quantities of each reactant, describe one way to determine the limiting reactant (in your own words). 5) In the following reaction lithium and oxygen are…

Grease fires can be extinguished by applying baking soda (sodium hydrogen carbonate), which decomposes due to the heat to produce sodium oxide, carbon dioxide and water. The carbon diocide produced helps to smother the flames. How many grams of baking soda would need to be thrown on to a fire to produce 0.500 moles (approximately 11 L) of carbon dioxide gas?

Given the following balanced chemical equation:                       Zn + 2 HCl → ZnCl2 + H2 Calculate the mass in grams of H2 will be produced, if 25.0 grams of Zn are reacted with 17.5 g of HCl.