PRACTICE EXAMPLE B: An 8.07 g sample of impure Ag20 decomposes into solid silver and O2(g)....
11. At elevated temperatures, sodium chlorate decomposes to produce sodium chloride and oxygen gas. A 0.8685-g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. The oxygen gas collected over water occupied 51.2 mL at a temperature of 25°C and a pressure of 731 torr. Calculate the mass percent of NaClO3 in the original sample. (At 25°C the vapor pressure of water is 23.8 torr.)
B. Solid silver oxide decomposes at temperatures in excess of 300°C, yielding metallic silver and oxygen gas. A 3.13 g sample of impure silver oxidel yields 0.187 g oxygen. If silver oxide is the only source of O2, what is the percent silver oxide by mass in the sample? (15 pts.)
1. Silver oxide decomposes when heated: 2 Ag2O(s)4 Ag(s) + O2(g) If 5.76 g of Ag2O is heated and the O2 gas produced by the reaction is collected in an evacuated flask, what is the pressure of the O2 gas if the volume of the flask is 0.65 L and the gas temperature is 25 °C? (a) 0.94 atm (b) 0.039 atm (c) 0.012 atm (d) 0.47 atm (e) 3.2 atm 2. In the first step of the industrial process...
When solid CaCO3 is heated, it decomposes to give solid CaO and CO2 gas. A volume of 360 mL of gas is collected over water at a total pressure of 730 mmHg and 16 ∘C. The vapor pressure of water at 16 ∘C is 14 mmHg. CaCO3(s)→CaO(s)+CO2(g) a) What was the partial pressure of the CO2 gas? Express your answer with the appropriate units. b) How many moles of CO2 gas were in the CO2 gas sample? Express your answer...
Data Sheet Unknown Number Sample 2 Sample 1 Volume of Ha gas (ml.) 22.65 22.12 Temperature of water (C) 20 8 0 20.8 C Height of water column (mm) 324.9 210.2 Vapor pressure of water at above temperature (mmlig) 7.5 17.5 Barometric pressure (mmHg) 747.776 구4구. 구구6 CALCULATIONS (Show calculations) Pressure ofthe column of water (mmHg) Pressure of dry hydrogen (mmHg) Moles of Hydrogen Mass of Magnesium ribbon (g) Average mass of magnesium ribbon (g) Vapor Pressure of Water at...
The reaction 2H2O2(aq)→2H2O(l)+O2(g) is first order in H2O2 and under certain conditions has a rate constant of 0.00752 s−1 at 20.0 ∘C. A reaction vessel initially contains 150.0 mL of 30.0% H2O2 by mass solution (the density of the solution is 1.11 g/mL). The gaseous oxygen is collected over water at 20.0 ∘C as it forms. What volume of O2 will form in 73.9 seconds at a barometric pressure of 719.5 mmHg . (The vapor pressure of water at this...
When heated to 350 ∘C at 0.950 atm, ammonium nitrate decomposes to produce nitrogen, water, and oxygen gases: 2NH4NO3(s)→2N2(g)+4H2O(g)+O2(g) Part A How many liters of water vapor are produced when 25.7 g of NH4NO3 decomposes? Express your answer with the appropriate units. V = Part B How many grams of NH4NO3 are needed to produce 11.4 L of oxygen? Express your answer with the appropriate units. m = When solid CaCO3 is heated, it decomposes to give solid CaO and...
The reaction AB(aq)→A(g)+B(g) is second order in AB and has a rate constant of 0.0157 M−1⋅s−1 at 25.0 ∘C. A reaction vessel initially contains 250.0 mL of 0.130 M AB which is allowed to react to form the gaseous product. The product is collected over water at 25.0 ∘C. How much time is required to produce 226.0 mL of the products at a barometric pressure of 718.3 mmHg . (The vapor pressure of water at this temperature is 23.8 mmHg.)
The following reaction was performed over water: 2H2O2 (l) -> 2H2O (l) + O2 (g) What volume of "dry O2" was obtained if the amount of H2O2 used was 15.0g at a total pressure of 755.5 mmHg at a temperature of 25°C? The vapor pressure of water is 23.8 mmHg at 25°C.
3. A1.22 g solid sample of impure lead (11) nitrate was dissolved in 40.0 mL of distilled water and analyzed by gravimetric analysis. Sodium sulfate was delivered from a burette to precipitate the lead ions as lead sulfate. Sodium sulfate was added until no more precipitate was seen to form. The precipitate was filtered, washed an dried before been weighed. When weighed, the precipitate had a mass of 1.44 g. What is the mass percent of lead in the original...