A 1.000g sample of an unknown hydrocarbon containing only carbon and hydrogen is burned in excess oxygen to yield carbon dioxide and water. The masses of CO2 and H2O are 2.994g and 1.635g, respectively. What is the empirical(simplest) formula for this compound?
1.) What is the molarity of a solution made by dissolving 25.6 g of KOH (5601 g/mol) in enough water to make 3.00 L of solution? 2.) 2 Fe + 3 Cl2 ------> 2FeCl3 How many moles of Fe are needed to produce 76.4 g of FeCl3 (162.3 g/mol)? How many grams of Fe (55.8 g/mol) are needed to react with 123 g or cl2 (71.0 g/mo
If the value of Q is greater than Kp, then a. the system is in equilibrium b. the reaction will proceed to the right until equilibrium is established c. a catalyst is necessary to achieve equilibrium d. the reaction will go left or right depending on the reaction stoichiometry e. the reaction will proceed to
1. A collection of atoms, molecules, or ions that contains Avogadro's number of these items is called what? 2. The initial substances that undergo change in chemical reaction are called what? 3. The law that states that atoms are neither created nor destroyed in a chemical reaction, but may be rearranged, is called what? 4. T
What is the average molar atomic weight of chlorine, if the natural abundance of Cl-35 and Cl-37 isotopes are 75.4 molar % and 24.6 molar %, respectively? M(Cl-35) = 34.969 g/mole M(Cl-37) = 36.966 g/mole.
1.) What volume of water is needed to completely dissolve 1g of AgBr in Liters? 2.) What is the water solubility of AgCl in gams per liter?
Earth has a mass of 5.98 x 10^24 kg. The average mass of atoms that compose earth is 40u. How many atoms in the earth?
When all of the water of hydration was driven off of 4.32g of a hydrate of compound Z, the residue, the anhydrous form of Z, had a mass of 3.09g. What is the formula of the hydrate (using the symbol Z as part of it)? The formula mass of Z is 90.0
When 8.900 g of a mixture of an alkali metal chloride (XCl) and an alkaline earth chloride (YCl2) was dissolved in 150.0g of water, the freezing point of the resultant solution was -4.42C. Addition of an excess of aqueous AGNO3 to the solution yielded a white precipitate with a mass of 27.575 g (This white precipitate would be
Determining the limiting reactant based on the chemical equation and the available quantity of the reactants.
For the balanced reaction: N2H4 + 2H2O2 = N2 + 4H2O 12.0 g N2H4 is reacted with 23.0 g H2O2. Which is the limiting reactant?
Balancing a chemical equation and calculating the reactant quantity based on the reaction stoichiometry.
Balance the following equation: Cu(s)+ AgNO3(aq) = Ag(s) + Cu(NO3)2(aq) ("s" and "aq" in parantheses refers to the phase of the reactants and products, i.e. solid and aqueous, respectively.) What is the amount of Cu (in grams) necessary to precipitate 0.50 g of Ag in the presence of excess AgNO3?
A compound contains carbon, hydrogen, and oxygen. A 10 g sample is analyzed for carbon and hydrogen. It contains 1.315 g hydrogen and 5.213 g carbon. What is the empirical formula for this compound?
What are the products of the following radioactive decays? A. Alpha emission by: 162 Re 75 B. Beta emission by: 188 W 74 C. Positron emission by: 165 Ta 73
1. Find out 2 or 3 uses for mercury. 2. For each use find out why mercury was chosen for the job 3. What are the dangers from using mercury.
How many moles of oxygen gas will react with 6.2 mol Al in the following reaction? 4Al + 3O2 -> 2Al2O3.
Which substance contains the greatest mass of bromine? a) 60.0g NaBrO3 b) 30.0g MgBr2 c) 5.0g HBrO4 d) 0.10 mol KBr e) 0.10 mol HBr
How many moles of oxygen atoms are there in 3.00g of sodium dichromate, Na2CrO7?
Burning 2.00g of propane, C3H8, produces 99.78 kJ of energy. How much energy is produced when one mole of the propane burns?
Determining the number of grams required by a reactant to produce a set number of grams of the product.
Oxygen gas can be prepared in a Laboratory by the reaction: 2KClO3(s) => 2KCl(s) + 3O2(g) How many grams of KClO3 must be reacted to produce100g of O2?