9.00 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molecular molar mass of 192. g/mol, is burned completely in excess oxygen, and the mass of the products carefully measured: product mass carbon dioxide 12.38 g water 3.38 g Use this information to find the molecular formula of X.

If 5.3 g of hydrogen gas is reacted with 12.6 g of oxygen gas to produce water, the hydrogen is the A reagent and the oxygen is the A reagent.

A given compound is analyzed and found to contain only C, H and O. When a 35.79 g sample of this compound is completely combusted in the presence of excess oxygen, the reaction yields 49.19 g of carbon dioxide and 13.43 g of water. What is the empirical formula of this compound?

Imagine that you perform a combination reaction between 60.0 g of sodium metal (Na) with 10.0 g of nitrogen gas (N2).  Write the balanced chemical equation

Abel reacts copper with silver nitrate and recovers 5.2 g Ag. However, after mass to mass stoichiometry , he discovers that the maximum yield of silver should have been 9.5 g. What is his percent yield?

Consider the copper thermite reaction, a reaction between two solids that can be initiated with strong heating: 3 CuO(s) + 2 Al(s) → 3 Cu(s) + Al2O3(s) 25.0 g of copper(II) oxide are combined with 25.0 g of Al , and the mixture is heated strongly to react. molar masses (g/mol):  CuO - 79.55    Al - 26.98    Cu - 63.55 What is the chemical formula or elemental symbol for the limiting reactant?   What is the chemical formula or elemental symbol for the excess reactant?

Hydrogen peroxide is used as a cleaning agent in the treatment of cuts and abrasions for several reasons. It is an oxidizing agent that can directly kill many microorganisms; it decomposes upon contact with blood, releasing elemental oxygen gas (which inhibits the growth of anaerobic microorganisms); and it foams upon contact with blood, which provides a cleansing action. In the laboratory, small quantities of hydrogen peroxide can be prepared by the reaction of an acid on an alkaline earth metal peroxide, such as barium peroxide. BaO2 + HCl ---> H2O2 + BaCl2 What amount of hydrogen peroxide should result when 1.17 g of barium peroxide is treated with 28.0 mL of hydrochloric acid solution containing 0.0288 g of HCl per mL? _____ g H2O2

Consider the following balanced chemical reaction: N2 (g) + 3 H2 (g) → 2 NH3 (g) What is the maximum mass (in grams) of ammonia (NH3) that can be produced from 9.36 g of N2 and 4.92 g of H2?

DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction: 2C6H5 Cl + C₂2 HOC13 → C14H9 Cl5 + H₂O chlorobenzene chloral DDT In a government lab, 1167 g of chlorobenzene is reacted with 470 g of chloral. a. What mass of DDT is formed, assuming 100% yield? g b. Which reactant is limiting? Which is in excess? is limiting. Mass= is in excess. c. What mass of the excess reactant is left over? g in excess d. If the actual yield of DDT is 285.0 g, what is the percent yield? Percent yield = % Mass=

A mass of 2.50 g of hydrated copper (II) sulfate is placed in a crucible and heated. On heating, 1.59 g of white anhydrous copper (II) sulfate is left behind. Determine the percentage of water in copper (II) sulfate.