Standard Temperature and Pressure

Which of the following gases has the highest density at STP?   A. sulfur trioxide, SO 3 B. carbon dioxide C. NO 2 D. argon E. nitrogen 

A sample of N2 gas occupies a volume of 746 mL at STP. What volume would N 2 gas occupy at 155°C at a pressure of 368 torr?   1. 983 mL 2. 566 mL 3. 3295 mL 4. 312 mL 5. 588 mL 6. 323 mL 7. 2415 mL 8. 1792 mL

Which gas sample has the greatest volume at STP? a. 5g Ar b. 5g Rn c. 5g Ne d. 5g Kr e. 5g Xe

Determine the theoretical yield of K 2CO3 when 0.392 moles of KO 2 react with 29.0 L CO2 (at STP – 0°C, 1 atm). The molar mass of KO 2 = 71.10 g/mol and K 2CO3 = 138.21 g/mol. 4KO2(s) + 2CO2(g) → 2K2CO3(s) + 3O2(g)   a. 27.1 g b. 179 g c. 91.7 g d. 206 g e. 61.0 g

Assume this reaction is carried out in the apparatus diagram below. Nitric acid is produced commercially by the Ostwald process. In the first step, ammonium is oxidized to nitric oxide: 4 NH 3(g) + 5 O 2(g) → 4 NO(g) + 6 H 2O(g) The stopcock between the two reaction containers is opened, and the reaction proceeds using proper catalysts. Calculate the partial pressure of NO after the reaction is complete. Assume 100% yield for the reaction, assume the final container volume is 3.00 L, and assume the temperature is constant. 1. 0.333 atm 2. 0.500 atm 3. 0.250 atm 4. 0.400 atm 5. 1.50 atm

At STP what volume of N 2 will react completely with 22.2 L H 2 to produce NH3? N2(g) + 3H2 (g) → 2NH 3 (g)   a. 7.4 L b. 14.8 L c. 22.2 L d. 44.4 L e. 66.6 L

Determine the volume of O2 (at STP) formed when 50.0 g of KClO 3 decomposes according to the following reaction. 2 KClO3 (s) → 2 KCl (s) + 3 O2 (g) A) 8.22 L B) 9.14 L C) 14.6 L D) 12.3 L E) 13.7 L

The action of some commercial drain cleaners is based on the following reaction: 2 NaOH (s) + 2 Al (s) + 6 H2O (l) → 2 NaAl(OH)4 (s) + 3 H 2 (g) What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH? A) 8.59 L B) 3.50 L C) 5.25 L D) 7.87 L

An ideal gas occupies 49.0 L at 994 torr and 41.0°C. What volume would it occupy at STP?  1. 0.0136 L 2. 73.7 L 3. 55.7 L  4. 58.7 L 5. 105 L 6. 39.1 L 7. 69.9 L 8. 0.0179 L 9. 22.4 L

What is the volume occupied at STP by a mixture of 4.00 g of He(g), 2.00 g of H2(g) and 32.0 g of O2(g)? A. 6.15 L B. 11.2 L C. 22.4 L D. 44.8 L E. 67.2 L

What is the density of Xe gas at STP? Give your result in g/L.a. 0.00156b. 64.0c. 5.86d. 5.37e. 0.178

Assuming ideal behavior, what is the density of argon gas at STP, in g/L?a) 0.0176 g/Lb) 0.0250 g/Lc) 1.63 g/Ld) 1.78 g/Le) 181. g/L

A mixture of hydrogen and helium is 25.0% hydrogen by mass. What is the partial pressure of hydrogen (in atm) in the mixture at STP?a) 0.460b) 0.399c) 0.520d) 0.250e) 0.380 

A 574cm3 volume of Na2CO3 solution was warmed with an excess of sulfuric acid until all action ceased. A 9.0 L volume of dry CO2 gas measured at STP was given off and collected. What was the molarity of the sodium carbonate solution?a) 0.30b) 0.40c) 0.50d) 0.60e) 0.70

Determine the theoretical yield of K2CO3 when 0.392 moles of KO2 react with 29.0 L of CO2 (at STP - 0°C, 1 atm). The molar mass of KO 2 = 71.10 g/mol and K2CO3 = 138.21 g/mol. 4 KO2(s) + 2 CO2(g) → 2 K2CO3(s) + 3 O2(g) a) 27.1 gb) 179 gc) 91.7 gd) 206 ge) 61.0 g 

Consider this reaction. CaCO3(s) → CaO(s) + CO2(g)What mass of CaCO3 will produce 8.0 L of CO2, measured at standard temperature and pressure conditions? The molar mass of CaCO3 is 100 g x mol -1. a) 4.5 gb) 12.5 gc) 36 gd) 280 g

Use the molar volume of a gas at STP to determine the volume (in L) occupied by 33.6 g of neon at STP. 

Use the molar volume of a gas at STP to calculate the density (in g/L) of nitrogen gas at STP. 

Automobile air bags inflate following a serious impact. The impact triggers the chemical reaction: 2 NaN3(s) →  2Na(s) + 3 N2(g)If an automobile air bag has a volume of 11.8 L, what mass of NaN 3 (in g) is required to fully inflate the air bag upon impact? Assume STP conditions.  

Hydrogen gas (a potential future fuel) can be formed by the reaction of methane with water according to the equation: CH4(g) + H2O(g) → CO(g) + 3 H2(g)In a particular reaction, 25.5 L of methane gas (measured at a pressure of 732 torr and a temperature of 25 °C) mixes with 22.8 L of water vapor (measured at a pressure of 702 torr and a temperature of 125 °C). The reaction produces 26.2 L of hydrogen gas at STP. What is the percent yield of the reaction?

A gaseous hydrogen and carbon containing compound is decomposed and found to contain 85.63% C and 14.37% H by mass. The mass of 258 mL of the gas, measured at STP, was 0.646 g. What is the molecular formula of the compound? 

If sufficient acid is used to react completely with 21.0 grams of Mg Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)  what volume of hydrogen at STP would be produced? 1. 9.68 liters 2. 19.37 liters 3. 10.60 liters 4. 22.40 liters 5. 4.84 liters

A hypothetical rock was harvested from another planet. Trapped inside was a diatomic gas. A volume of 1.25 mL of the gas was extracted from the rock at STP. The mass of the gas sample was determined to be 2.12 mg. Identify the gas.1. oxygen2. None of these3. hydrogen4. nitrogen5. fluorine

Using the graph below, determine the gas that has the lowest density at STP.A) AB) BC) CD) DE) All of the gases have the same density at STP.

Which of the following gases has the greatest density at STP?A) NO2 (molar mass = 46.01 g/mol)B) Xe (molar mass = 131.3 g/mol)C) SO2 (molar mass = 64.07 g/mol)D) SF6 (molar mass = 146.07 g/mol)E) All of these samples have the same density at STP.

What volume will 3.12 grams of helium occupy at STP? 

If the density of a gas 1.43 g/L at STP, what is the molecular weight of the gas?

Calculate the density of nitrogen gas at STP.A. 0.625 g/LB. 1.25 g/LC. 6.83 g/LD. 13.7 g/LE. Cannot be calculated with this information (undefined)

What volume will 40.0 L of He at 50.00°C and 1201 torr occupy at STP?A. 26.7 LB. 18.6 LC. 12.8 LD. 53.4 LE. 31.1 L

A balloon filled with helium occupies 20.0 L at 1.50 atm and 25°C. How many moles of helium will there be in the balloon at STP?A. 22.4 molesB. 1.12 molesC. 0.0446 molesD. 0.893 molesE. 1.23 molesF. 4.55 moles

If 250 mL of a gas at STP weighs 2 g, what is the molar mass of the gas?A. 179 g • mol-1B. 8.00 g • mol-1C. 56.0 g • mol-1D. 28.0 g • mol-1E. 44.8 g • mol-1

Standard conditions (STP) is defined as1. 273.15 K, 760 torr.2. 0 K, 250 atm.3. 100 K, 1 torr.4. 273.15 K, 250 torr.5. 0 K, 1 atm.

A sample of helium (He) occupies 4 liters at STP. What pressure is necessary to change the volume to 2 liters at 20°C? 1. 2.1464 atm 2. 2.0 atm 3. 2.36 atm 4. 4.361 atm 5. 4.0 atm

What volume will 0.780 moles of Xe occupy at STP?

Consider the following gas phase reaction:2NO(g) + O2(g) → 2NO2(g)400. mL of NO at STP is reacted with 500. mL of O2 at STP. Calculate the volume of the reaction mixture at STP after the reaction goes to completion.a. 700 mLb. 800 mLc. 900 mLd. 1300 mLe. 100 mL

Methane, CH4(g), reacts with steam to give synthesis gas, a mixture of carbon monoxide and hydrogen.CH4 (g) + H2O(g) → CO(g) + H2(g) [unbalanced]What mass of hydrogen is formed if 275 L of methane (measured at STP) is converted to synthesis gas? 

One mole of nitrogen and one mole of neon are combined in a closed container at STP.How big is the container?

Which of the following samples will have the greatest volume at STP?a. 22 g Neb. 22 g Hec. 22 g O2d. 22 g Cl2 e. All have the same V at STP

Which of the following gases has the largest density at STP?a. Heb. C2H2 c. F2d. N2e. H2

Consider the reaction:2SO2(g) + O2(g) → 2SO3(g)If 276.2 mL of SO2 is allowed to react with 172.8 mL of O 2 (both measured at STP), what is the theoretical yield of SO3?

Arrange the following gases in order of decreasing density at STP. Rank from largest to smallest.F2O2Cl2Ne

Find out the volume contained by 6.8 g of ammonia at STP. (N=14, H=1)

Use the molar volume of a gas at STP to calculate the density (in g/L) of nitrogen gas at STP. 

Lithium reacts with nitrogen gas according to the reaction: 6 Li(s) + N2(g) → 2 Li3N(s)What mass of lithium (in g) reacts completely with 58.5 mL of N2 gas at STP?

How many grams of phosphine (PH 3) can form when 37.5 g of phosphorus and 83.0 L of hydrogen gas react at STP?P4(s) + H2(g) ⟶ PH3(g)    [unbalanced]

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced.2Al (s) + 6HCl (aq) → 2AlCl3 (aq) + 3H2 (g) What volume in L of H2 (g) is produced when 7.40 g of Al (s) reacts at STP?

Consider the reaction between Mg(s) and HCl(aq) to produce aqueous magnesium chloride and hydrogen gas. What volume of hydrogen at STP will be produced when 12.15 g of magnesium reacts with an excess of hydrochloric acid?A. 1.00 LB. 2.00 LC. 5.6 LD. 11.2 LE. 22.4 L

How many moles of O 2 (molar mass = 32.00 g/mol) are needed to react completely with 52.0 L of CH4(g) at STP to produce CO 2 and H2O? (molar mass (CH 4) = 16.04 g/mol)a) 11.6b) 2.32c) 4.64d) 52.0e) 104 

Use the molar volume of a gas at STP to calculate the density (in g/L) of oxygen gas at STP.

An open flask sitting in a lab fridge looks empty, but we know that actually it is filled with a mixture of gases called air. If the flask volume is 1.50 L, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?

Calculate the volume occupied by 56.5 g of argon gas at STP. a) 22.4 L b) 31.7 L c) 34.6 L d) 1, 270 L e) 1, 380 L

The density of a gas is 1.96 g/L at STP. What would the mass of 2.00 moles of the gas be at STP?1. 87.8 g2. There is not enough information to solve.3. 44.8 g4. 0.0875 g5. 43.9 g6. 0.510 g

A 2.45-L flexible flask at 15°C contains a mixture of N2, He, and Ne at partial pressures of 0.283 atm for N2, 0.151 atm for He, and 0.425 atm for Ne. (a) Calculate the total pressure of the mixture in atm.(b) Calculate the volume in liters at STP occupied by He and Ne if the N 2 is removed selectively.

Which of the following samples has the greatest density at STP?a. SO2b. Arc. SF6d. NOe. He

Which gas sample has the greatest volume at STP?a. 20g of Neb. 2g of H2c. 8g of Hed. 20 g of N2

Calculate the density of oxygen, O2, under each of the following conditions: STP1.00 atm and 35.0°C Express your answers numerically in grams per liter. Enter the density at STP first and separate your answers by a comma. density at STP, density at 1 atm and 35.0°C = _____