Chemistry Questions & Answers

In a bromine-producing plant, how many liters of gaseous elemental bromine at \( 285,{ }^{\circ} \mathrm{C} \) and 0.927 atm are formed by the reaction of \( 456 . \mathrm{g} \) of sodium bromide and 178. g of sodium bromate in aqueous acid solution? (Assume no \( \mathrm{Br}_{2} \) dissolves and that sulfuric acid is present in large excess.) Round your answer to 3 significant figures. \( 5 \mathrm{NaBr}(a q)+\mathrm{NaBrO}_{3}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow 3 \mathrm{Br}_{2}(\mathrm{~g})+3 \mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \) Note: Reference the Fundamental constants table for additional information.)

Nitrogen dioxide is used industrially to produce nitric acid, but it contributes to acid rain and photochemical smog. What volume of nitrogen dioxide is formed at 784. tort and \( 28.2{ }^{\circ} \mathrm{C} \) by reacting \( 3.35 \mathrm{~cm}^{3} \) of copper \( \left(\mathrm{d}=8.95 \frac{\mathrm{~g}}{\mathrm{~cm}^{3}}\right) \) with \( 208 . \mathrm{mL} \) of nitric acid \( \left(\mathrm{d}=1.42 \frac{\mathrm{~g}}{\mathrm{~cm}^{3}}, 68.0 \% \mathrm{HNO}_{3}\right. \) by mass \( ) \) ? Round your answer to 3 significant figures. \[ \mathrm{Cu}(\mathrm{s})+4 \mathrm{HNO}_{3}(\mathrm{aq}) \rightarrow \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{NO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \] Note: Reference the Conversion factors for non-SI units and Fundamental constants tables for additional information.

In the average adult male, the residual volume \( (R V) \) of the lungs, the volume of air remaining after a forced exhalation, is 1140 . mL . Answer the following questions. Round each of your answers to 3 significant figures. Note: Reference the Fundamental constants table for additional information. Part: \( 0 / 2 \) Part 1 of 2 How many moles of air are present in the \( R V \) at 1.00 atm and \( 37.00^{\circ} \mathrm{C} \) ?

Will the volume of a gas increase, decrease, or remain unchanged for the following set of changes? The pressure is increased from 4.00 atm to 8.00 atm, while he temperature is increased from \( -25.0^{\circ} \mathrm{C} \) to \( 223 .{ }^{\circ} \mathrm{C} \). Select the single best answer. The volume will increase. The volume will decrease. The volume will not change.

Disponemos de una muestra de gas que a \( 200^{\circ} \mathrm{C} \) presenta una presión de \( 2,8 \mathrm{~atm} \) y un volumen de \( 15,9 \mathrm{~L} \). ¿Qué volumen ocupará el gas, si a la misma temperatura, la presión permanece en 890 mmHg ? ( 1,5 puntos)

Xenon hexafluoride was one of the first noble gas compounds synthesized. The solid reacts rapidly with the silicon dioxide in glass or quartz containers to form liquid \( \mathrm{XeOF}_{4} \) and gaseous silicon tetrafluoride. What is the pressure in a \( 0.500-\mathrm{L} \) container at \( 25^{\circ} \mathrm{C} \) after 6.51 g of xenon hexafluoride reacts? (Assume that silicon tetrafluoride is the only gas present and that it occupies the entire volume.) Round your answer to 3 significant figures. Note: Reference the Fundamental constants table for additional information.

Xenon hexafluoride was one of the first noble gas compounds synthesized. The solid reacts rapidly with the silicon dioxide in glass or quartz containers to form liquid \( \mathrm{XeOF}_{4} \) and gaseous silicon tetrafluoride. What is the pressure in a \( 0.500-\mathrm{L} \) container at \( 25^{\circ} \mathrm{C} \) after 6.51 g of xenon hexafluoride reacts? (Assume that silicon tetrafluoride is the only gas present and that it occupies the entire volume.) Round your answer to 3 significant figures. Note: Reference the Fundamental constants table for additional information.

Xenon hexafluoride was one of the first noble gas compounds synthesized. The solid reacts rapidly with the silicon dioxide in glass or quartz containers to form liquid \( \mathrm{XeOF}_{4} \) and gaseous silicon tetrafluoride. What is the pressure in a \( 0.500-\mathrm{L} \) container at \( 25^{\circ} \mathrm{C} \) after 6.51 g of xenon hexafluoride reacts? (Assume that silicon tetrafluoride is the only gas present and that it occupies the entire volume.) Round your answer to 3 significant figures. Note: Reference the Fundamental constants table for additional information.

How do you convert mg L to ppm?

Ammonium nitrate, a common fertilizer, is used as an explosive in fireworks. How many liters of gas at \( 307^{\circ} \mathrm{C} \) and 1.00 atm are formed by the explosive decomposition of 26.3 kg of ammonium nitrate to nitrogen, oxygen, and water vapor? Round your answer to 3 significant figures. Note: Refence the Fundamental constants table for additional information.