Dilute aqueous hydrogen peroxide is used as a bleachingagent and for disinfecting surfaces and small cuts. Its concentra-tion is sometimes given as a certain number of “volumes hydro-gen peroxide,” which refers to the number of volumes of O₂ gas,measured at STP, that a given volume of hydrogen peroxide so-lution will release when it decomposes to O₂ and liquid H₂O.How many grams of hydrogen peroxide are in 0.100 L of “20volumes hydrogen peroxide” solution?

for this question. Sodium metal reacts with water to produce hydrogen gas according to the following equation: 2Na(s) + 2H,0(1)→2NAOH(aq) + H2(g) The product gas, H2, is collected over water at a temperature of 20 °C and a pressure of 759 mm Hg. If the wet H, mol. The vapor gas formed occupies a volume of 9.89 L, the number of moles of Na reacted was pressure of water is 17.5 mm Hg at 20 °C.

The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (C3H8) to burn it completely. For every gram of propane that flows through the burner, what volume of air is needed to burn it completely? Assume that the temperature of the burner is 205.0°C, the pressure is 1.25 atm, and the mole fraction of O2 in air is 0.210.

9. a) You have determined experimentally that at standard temperature and pressure (0 °C and 1 atm) that you have a gas weighing 0.1977 g in a 100 mL sealed container. What is the molecular weight of the unknown gas?

How many grams of sodium hydrogen carbonate decompose to give 23.4 mL of carbon dioxide gas at STP? 2NaHCO3(s)⟶ΔNa2CO3(s)+H2O(l)+CO2(g) Express your answer with the appropriate units. mNaHCO3=

A sample of nitrogen gas has a volume of 167.0 mL at STP. What volume (in mL) does the gas occupy if the temperature is increased by 55.3 ºC and the pressure is doubled? 200.0 mL of 3.96 M hydrochloric acid is added to 100.0 mL of 4.60 M barium hydroxide. After the reaction goes to completion, what is the concentration (in mol/L) of the excess H+(aq) or OH–(aq) that remains in solution? Assume that the volumes are additive. Aqueous solutions of the following reactants are mixed. After the reaction goes to completion, calculate the concentration (in mol/L) of silver ions in solution. 160.0 mL of 3.50 M AgNO3 are mixed with 150.0 mL of 1.50 M CaCl2. Consider the following reaction: 2 NH3 (g)   +   3 Cl2 (g)   →   N2 (g)   +   6 HCl (g) A mixture is prepared from 15.0 mol of ammonia and 15.0 mol of chlorine gas. Determine the total moles of gas in the container after the reaction has gone to completion.

A mixture of solid calcium oxide,  CaO,  and solid barium oxide,  BaO,  weighing  3.145 g  is added to a  2.00 L  flask containing carbon dioxide,  CO2,  at  30 ∘C.  The  CaO  and  BaO  react completely with the carbon dioxide gas to form solid  CaCO3  and  BaCO3,  respectively. Calculate the moles of  CO2  consumed by the reaction if the initial pressure of  CO2  gas was  0.796 atm  and the final pressure of  CO2  gas is  0.394 atm. moles of  CO2: molWhat is the mass percentage of  CaO  in the solid mixture? mass percent  CaO: % What is the mass percentage of  BaO  in the solid mixture?mass percent  BaO: %

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5. You are given 1.56 g of a mixture of KClO3 and KC1. When the mixture is heated the oxygen gas liberated displaces 327 mL of water at a temperature of 19°C. The total pressure of the gas in the collection flask is 735 mmHg. What is the percentage of KClO3 in the mixture?

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