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m>89. Ammonia and gaseous hydrogen chloride combine to form ammonium chloride.
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Chapter 13 Solutions
Introductory Chemistry: A Foundation
- 91 A 0.2500-g sample of an Al-Zn alloy reacts with HCl to form hydrogen gas: 2Al(s)+6H+(aq)2Al3+(aq)+3H2(g) Zn(s)+2H+(aq)Zn2+(aq)+H2(g) The hydrogen produced has a volume of 0.147 L at 25°C and 755 mm Hg. What is the percentage of zinc in the alloy?arrow_forwardA chemist vaporized a liquid compound and determined its density. If the density of the vapor at 90C and 753 mmHg is 1.585 g/L, what is the molecular weight of the compound?arrow_forwardA gaseous organofluorine compound has a density of 0.355 g/L at 17 C and 189 mm Hg. What is the molar mass of the compound?arrow_forward
- 5-34 A sample of 30.0 mL of krypton gas, Kr, is at 756 mm Hg and 25.0°C. What is the new volume if the pressure is decreased to 325 mm Hg and the temperature is decreased to-12.5°C?arrow_forwardHelium-filled balloons rise in the air because the density of helium is less than the density of air. (a) If air has an average molar mass of 29.0 g/mol, what is the density of air at 25C and 770 mm Hg? (b) What is the density of helium at the same temperature and pressure? (c) Would a balloon filled with carbon dioxide at the same temperature and pressure rise?arrow_forwardIf 456 dm3 of krypton at 101 kPa and 21C is compressed into a 30.1-dm3 tank at the same temperature, what is the pressure of krypton in the tank?arrow_forward
- A 36.0—L cylinder of a gas used for calibration of blood gas analyzers in medical laboratories contains 350 g CO2, 805 g 02, and 4,880 g N2. At 25 degrees C. what is the pressure in the cylinder in atmospheres?arrow_forward104 When a 0.817-g sample of a copper oxide is heated with excess hydrogen gas, a reaction takes place, and 0.187 g of water is formed. What is the apparent formula of the copper oxide?arrow_forwardFor a spacecraft or a molecule to leave the moon, it must reach the escape velocity (speed) of the moon, which is 2.37 km/s. The average daytime temperature of the moons surface is 365 K. What is the rms speed (in m/s) of a hydrogen molecule at this temperature? How does this compare with the escape velocity?arrow_forward
- Potassium peroxide is used to absorb the CO2 produced by the people in a space vehicle. 2K2O2(s)+2CO2(g)2K2CO3(s)+O2(g)If a person at rest exhales 3.0 L of air per minute and CO2 is 3.4% (by volume) of exhaled air, how many grams of K2O2 are needed per person for a five-day trip. Assume a temperature of 250 and 728 mm Hg pressure.arrow_forwardThe density of air at 20C and 1.00 atm is 1.205 g/L. If this air were compressed at the same temperature to equal the pressure at 50.0 m below sea level, what would be its density? Assume the barometric pressure is constant at 1.00 atm. The density of seawater is 1.025 g/cm3.arrow_forwardA mixture contained calcium carbonate, CaCO3, and magnesium carbonate, MgCO3. A sample of this mixture weighing 7.85 g was reacted with excess hydrochloric acid. The reactions are CaCO3(g)+2HCL(aq)CaCl2(aq)+H2O(I)+CO2(g)MgCO3(s)+2HCL(aq)MgCl2(aq)+H2O(I)+CO2(g) If the sample reacted completely and produced 1.94 L of carbon dioxide, CO2, at 25C and 785 mmHg, what were the percentages of CaCO3 and MgCO3 in the mixture?arrow_forward
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