50.0 g of an oxide of Chromium (Cr) was found to contain 13.28g of potassium (K), 17.68 g of Chromium (Cr) and 19.04 g of oxygen (O). Find the simplest formula...
How many molecules are contained in one drop (0.050 mL) of water (density 1.0 g/mL)?
A titration of 0.100 M Cl^- with 0.100 M Ag^+ used an end point where silver chromate gives an orange precipitate. Select the concentration of potassium chromate that must be present so the orange-colored silver chromate precipitate will appear just when 99.5% of the chloride has been precipitated. Given: Ksp of AgCl = 1.0 x 10
Question: If 50 mL each of 0.0010 M MgCl2, 0.0010 M Na3PO4, 2.0 M NH3 and 2.0 M NH4Cl are mixed, will a precipitate form?
Oxygen can be preparead in a lab by the reaction: 2KCLO3 = 2H2(g) + O2(g) Question: How many grams of KCLO3 must be reacted to produce 100 g of O2?
Dry air near sea level has the following composition by volume: N_2, 78.08%; O_2 20.94%; Ar, 0.93%; CO_2 0.05%. the atmospheric pressure is 1.00 atm. calculate the partial pressure of each gas in atm and the concentration of each gas in moles per liter at 0 degrees C.
C2H5OH burns in air: C_2H_5OH(l)+O_2 --->CO_2(g)+H_2O(l) balance the equation and determine the volume of air in liters at 35.0 C and 790 mmHg required to burn 227 g of ethanol. assume that air is 21.0 percent O_2 by volume.
Calculate the density of HBr gas in grams per liter at 733 mm Hg and 46 degrees C.
How many grams of CO2 are obtained after the combustion of 280g of butane?
0.292g of NaCl is dissolved in 200ml of water. Calculate the molality and molefraction of the solute in the solution. Molecular weight of NaCl = 58.5 g/mol
For my AP chemistry lab, I was supposed to find the percent of silver in a dime. I started out with the formula: Ag + NaCl → AgCl +Na. The dime was put in a covered beaker with NaCl. However, during the experiment oxygen was added as one of the reactants, accidentally. The precipitated silver chloride was obviously con
A sample of a mixture containing only sodium chloride and potassium chloride has a mass of 3.5650g. When this sample is dissolved in water and excess silver nitrate is added, a white precipitate (silver chloride) forms. After filtration and drying, this precipitate has the mass 7.9143g. What is the mass percentage of sodium ch
The chloride in a saline solution was determined by the Volhard method. A 25 ml aliquot of the solution was acidified with 2 ml of dilute HNO3 and treated with 25 ml of .1749 M AgNO3 (fw 169.9), causing precipitation of AgCl. After addition of several ml of nitrobenzene, the solution required 26.40 ml of .1575 M KSCN to reach t
Write the stoichiometric equation for magnesium nitride plus water that yields magnesium hydroxide and ammonia gas.
The thallium (present as Tl2SO4) in a 7.80-g pesticide sample was precipitated as thallium(I)iodide. Calculate the mass percent of Tl2SO4 in the sample if 0.890g of TlI was recovered.
See the attachment for the full problem statement. Finding the mass of a reactant in an industrial equation: Cu(NH3)4Cl2(aq) + 4 NH3(aq) + Cu(s) --> 2 Cu(NH3)4Cl(aq)
The element Europium exists in nature as two isotopes: 151Eu has a mass of 150.9196 amu, and 153Eu has a mass of 152.9209 amu. The average atomic mass of europium is 151.96 amu. Calculate the relative abundance of the two europium isotopes.
The Density is 7.87g/cm^3 , and the average mass for a single iron atom is 9.28*10^-23g . How many iron atoms are present in a iron bar whose dimensions are 2.00 cm * 3.00 cm * 8.00 cm ?
A cube of material with a length of 0.044 m and mass of 10.00 X 10 to the negative 1 power kg. What is the density (g/mL)?
What is the density of a 100.000 grams cubic object that has a length of 0.025 meters?
If a patient has 0.08 ppm lead in their blood, how many micrograms would be contained in a liter of blood?
In spontaneous nuclear reactions: a. the products weigh less than the reactants b. the products weigh more than the reactants c. the difference in mass between reactants and products is zero d. mass is converted to light e. the products move at the speed of light squared
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
Application of the mass-energy equivalence principle in stoichiometric calculations: calculation of weight loss during a nuclear fission reaction.
The nuclear fission energy for the isotope U-235 is 1.67x10^10 kJ/mole. What is the mass of the fission products produced from 1.000 kg of radioactive material U-235? What is the percent weight loss?
How many coulombs of charge are required to deposit 2.00g of Fe(s) from a solution of Fe3+?
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?
You have a mixed solution in a beaker which contains a bag of 4g dissolved in 15ML of water. The beaker contains 50g of glucose dissolved in 200mL of water. What is the percentage concentration of the two solutions? Does the glucose diffuse out or into the bag? And what will happen to the water?
The chlorophyll-a molecule, C55H72MgN4O5, is important in photosynthesis. (a) Determine its molecular mass (in atomic mass units) (b) What is the mass (in grams) of 3.00 moles of chlorophyll-a molecules?