Gaseous and liquid states Questions and Answers

How many liters of N₂ gas at 1.03 atm and 27.54 °C are produced by the decomposition of 151.3 g of NaN3? 2NaN3(s)→ 2Na(s) + 3N₂(g) Keep the answer with 2 decimal places. Do not write unit in answer.

When a sample of gas with a volume of 638.7 mL and a pressure of 0.968 atm was heated from 17.99 °C to 45.84 °C, its volume become 696.4 mL. What was its final pressure in atm? Keep the answer with 2 decimal places. Do not write unit in answer.

A gaseous element has a density of 7.640 g /L when the temperature is 35.39 °C and the pressure is 736.7 torr. What is the molecular mass (g/mol) of the gas? Keep the answer with 2 decimal places. Do not write unit in answer. 3.22

Based on the equations for today's reaction: 2 S₂O3²- + I2 --> S40O6²- +2I- 2 Cu²+ + 4I- → 2 Cul (s) + I₂ How many moles of copper would be used in a reaction that needed 5 mol of S₂O3²-

A balloon contains 7.2 L of Helium at 290 K. The pressure is reduced to 2.00 atm and the balloon expands to occupy a volume of 25.1 L. What was the initial pressure exerted on the balloon if the temperature remains constant? 0.697 atm 0.562 atm 5.62 atm 6.97 atm

Benzene has a boiling point of 80.1 °C, and a specific heat capacity of 1.8 J/g °C in the liquid phase and 1.92 J/g °C in the gas phase. The ΔHvaporization of benzene is 30.77 kJ/mol. How much heat is released when 32 g of benzene in the gas phase is cooled from 101 °C to 51.5 °C?

If 1.0 L of gas at STP is compressed to 0.473 L. What is the new pressure of the gas? 13.6 atm 2.7 atm 0.002 atm 2.11 atm

How many moles of a gas must be placed in a 3.00 L container in order to exert a pressure of 2.00 atm at 25.0°C? 0.245 mol 0.289 mol 2.92 mol 0.00242 mol

Gases diffuse through polar liquids more quickly than they diffuse through other gases. True False

The pressure of a gas is reduced from 1200.0 mmHg to 850.0 mmHg as the volume of its container is increased by moving a piston from 0.085 L to 0.350 L. What would the final temperature be if the original temperature was 90.0 °C? 1060 K 568 K 1390 K 124 K

The solubility of oxygen gas in water is approximately 0.00498 g/L. when the temperature is 25.0°C and the partial pressure of gaseous oxygen is 756.8 torr. What will the solubility of oxygen (in g/L) be if the oxygen pressure is adjusted to 951.3 torr? Do not write unit in answer. Report your answer with the correct sig figs, don't use scientific notation.

Sparkling water has carbon dioxide dissolved in water to give it a "fizz." Colder pop lets the carbon dioxide stay dissolved in the water for a longer time. In this situation the carbon dioxide is the: Select one: solution solvent solute molarity

Two flasks are connected with a stopcock. The first flask has a volume of 5 liters and contains nitrogen gas at a pressure of .75 atm. The second flask has a volume of 8 L and contains oxygen gas at a pressure of 1.25 atm. When the stopcock between the flasks is opened and the gasses are free to mix, what will be the pressure of the resulting mixture?

A 4.53 g sample of candy is placed in a bomb calorimeter and combusts in excess oxygen. The temperature of the calorimeter increases from 22.17°C to 25.36°C. The heat capacity of the calorimeter is 30.50 kJ/K. How many nutritional Calories are there per gram of the candy?

Consider a system consisting of a cylinder with a movable piston containing 106 gas molecules at 298 K at a volume of 1 L. Consider the following descriptions of this system, arrange them in order of increasing number of microstates in the resulting system Rank from most to fewest microstates. To rank items as equivalent, overlap them Starting from the initial system, the volume of the container is changed to 2 L and the temperature to 395 K. Starting from the initial system, the temperature is changed to 395 K at constant volume. Starting from the initial system, the gas reacts completely to produce 10^7 gas molecules at 395 K in a volume of 2 L. Starting from the initial system, a combination reaction occurs at constant volume and temperature. Initial system, as stated in the problem statement.

A hot air balloon is filled with 1.31 x 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 127 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.

An air bubble has a volume of 0.520 L at 19 °C. What is the volume, in liters, at 2 °C, if n and P do not change? Express the volume to two significant figures and include the appropriate units.

Which of the following numbers has four significant figures? 1. 0.001209 II. 2.450x104 III. 12079 IV. 0.000002023 I and II III and IV I, II, and IV I, II, and III

How many moles of Compound X do you have if you contained 5.00 L of it in a balloon, at a temperature of 400. K and a pressure of 1.05 atm? Based on your answer to part o, how many molecules of Compound X do you have?

Which of the following statements is not true of the phases of a given substance? A. The particles of a liquid move past one another. B. The particles of a gas move quickly. C. Solids have strong intermolecular forces between the atoms or molecules. D. The particles of solids have more kinetic energy than the particles of liquids or gases.

It rained early this morning. Rose saw a puddle of water on the sidewalk when she traveled to school. The water in the puddle vanished when she came back. What happened to the water in the puddle? It evaporated It melted It condensed None of the choices

Solubility is the maximum amount of a solute that can be dissolved in a given quantity of solvent at a given temperature. Why do we need to know the temperature of the solution when measuring solubility?

Which of the following states of matter has heither a definite shape nor a definite volume? Solid Liquid Gas Rubber

An oxygen molecule contains a double bond because the two atoms of oxygen share a total of 1. 1 electron 2. 2 electrons 3. 3 electrons 4. 4 electrons

What are the properties of gases? No fixed shape and fixed volume No fixed shape and volume Fixed shape and fixed volume Fixed shape and no fixed volume

If the gas burette is not resting at the bottom of the beaker,and the Mg ribbon does not fully dissolve as a result, how would this effect your result? (MORE THAN ONE ANSWER CAN BE SELECTED) the value for your R will be higher than it is supposed to be the value for your R will be lower than it is supposed to be moles of gas evolved will be lower than they are supposed to be moles of gas evolved will be higher than they are supposed to be

What is the hybridization of the N in this amine? CH3-N-CH₂ CH3

For the conversion of the iron ore hematite (Fe2O3) to iron in a blast furnace,one step is this balanced equation: Fe₂O3 +3 CO 2Fe + 3 CO₂ If 25 moles of hematite is reacted, how many kilograms of iron can be formed? Molar mass of Fe: 55.85 g/mol. 2.8 kg Fe 25 kg Fe 1.4 kg Fe 50 kg Fe

A 0.522 mol sample of methane gas is collected at a pressure of 733 mmHg and a temperature of 20.0°C. The volume of the sample is _______ L.

The gas in a sealed can is at a pressure of 3.00 atm at 250C. A warning on the can tells the user not to store the can in a place where the temperature will exceed 520C. What would the gas pressure in the can be at 520C? What law did you use to solve?

An iron nail rusts when exposed to oxygen. How many grams of iron are needed to completely consume 21.8 L of oxygen gas according to the following reaction at 25 °C and 1 atm? iron (s) + oxygen (g) → iron (III) oxide (s) ____grams iron

A boy with pneumonia has lungs with a volume of 1.9 L that fill with 0.080 mol of air when he inhales. When he exhales, his lung volume decreases to 1.5 L. Enter the number of moles of gas that remain in his lungs after he exhales. Assume constant temperature and pressure. n = mol

What temperature scale must always be used to specify temperature in a gas law calculation? Celsius Kelvin Fahrenheit logarithmic

A balloon is inflated to a volume of 6.0 L on a day when the atmospheric pressure is 1.013 bar. The next day, a storm front arrives, and the atmospheric pressure drops to 0.970 bar. Assuming the temperature remains constant, what is the new volume of the balloon, in liters?

0.1 moles of solid sodium metal are added to excess water at 298 K. Find the pressure of hydrogen gas produced in a 10.0 L container. 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g) A) 0.122 atm B) 0.244 atm C) 0.115 atm D) 0.255 atm E) 0.366 atm

When 50.0 mL of 2.00 M NaOH(aq) and 50.0 mL of 2.00 M HCl(aq) are mixed in a coffee-cup calorimeter, the temperature of the solution rose from 21.81°C to 30.29°C. Given the density of the solution is 1.00 g/mL. Assuming the heat capacity of the cups is 5.00 J/°C, what is the amount of heat exchange (in J) of the calorimeter (acal)?

A sample of oxygen gas was collected via water displacement. Since the oxygen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 26.4 °C is 795 torr, what is the partial pressure of oxygen? The vapor pressure of water at 26.4 °C is 25.81 mm Hg.

A 1.20 L weather balloon on the ground has a temperature of 25.0°C and is at atmospheric pressure (1.00 atm). When it rises to an elevation where the pressure is 0.720 atm, then the new volume is 1.80 L. What is the temperature (in °C) of the air at this elevation?

When solid calcium carbonate is reacted with aqueous hydrochloric acid, the products of the reaction include aqueous calcium chloride, liquid water, and gaseous carbon dioxide. Calculate the volume of CO2 gas (in L) collected over water at 25.0 °C when 25.1 g of calcium carbonate is added to excess hydrochloric acid if the total pressure is 911.0 mmHg. The vapor pressure of water at 25.0 °C is 23.8 mmHg.

The van der Waal's constants a and b for a gas of molar mass 164.2 g/mol are atm-L²/mol² and 0.1 L/mol, respectively. The Boyle's temperature of the 4.105 gas is xK. Then the value of X 100 is (to the nearest integer)

The first ionization energies of potassium and calcium are somewhat similar, 419 kJ/mol and 590 kJ/mol, respectively. However, the melting points are significantly different: The melting temperature of potassium is 63.5 °C and the melting temperature of calcium is 842 °C. Clearly explain this large difference in melting temperatures.

The pressure of a sample of argon gas was increased from 3.34 atm to 8.18 atm at constant temperature. If the final volume of the argon sample was 16.2 L, what was the initial volume of the argon sample? Assume ideal behavior.

Suppose that Daniel has a 3.00 L bottle that contains a mixture of O₂, N₂, and CO₂ under a total pressure of 4.80 atm. He knows that the mixture contains 0.230 mol N₂ and that the partial pressure of CO₂ is 0.350 atm. If the temperature is 273 K, what is the partial pressure of O₂? Po₂ = atm

A biology experiment requires the preparation of a water bath at 37.0 °C. The temperature of the cold tap water is 22.0 °C, and the temperature of the hot tap water is 55.0 °C. If a student starts with 90.0 g of cold water, what mass of hot water (in grams) must be added to reach 37.0°C? (Assume specific heats of cold and hot water to be the same). (Enter answer without units)

A container is filled with an ideal gas to a pressure of 11.0 atm at 0°C. a. What will be the pressure in the container if it is heated to 45°C? b. At what temperature would the pressure be 6.50 atm? would the pressure be 25.0 atm? c. At what temperature

As energy is added to a substance, the temperature remains constant. How may the substance be changing? a. From a gas to a solid b. From a liquid to a gas c. From a liquid to a solid d. In the amount of kinetic energy contained in the molecules.

14. Which of the following statements about reaction types is FALSE? a. Neutralization reactions are always metathesis reactions. b. A precipitation reaction always involves a change in oxidation number. c. Combination reactions may be redox reactions. d. Precipitation reactions involve both strong and weak electrolytes.

What is the relationship between the change in temperature of the objects? A. The metal will change in temperature more than the water. B. The water will change in temperature more than the metal. C. The water and metal will have the same temperature change D. It depends on the masses and heat capacities of the substances, so it cannot be determined with the information given.

Which of the following mixtures are solutions? Check all that apply. salt and water mixture oil and water mixture sand and water mixture sterling silver cup

A sample of Cl, gas has a volume of 11.0 L at a pressure of 1.50 atm and a temperature of 23 °C. What volume, in liters, will the gas occupy at 3.50 atm and 261 °C? Assume ideal behavior.