# A 0.0097561 g quantity of an unknown gas occupies 0.2 L at 500 K and 2 atm. What is the Molecular Weight (MW) of the gas ?

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1. ## chem

A 0.0097561 g quantity of an unknown gas occupies 0.2 L at 500 K and 2 atm. What is the Molecular Weight (MW) of the gas ?
2. ## chem

A 0.0097561 g quantity of an unknown gas occupies 0.2 L at 500 K and 2 atm. What is the Molecular Weight (MW) of the gas ?
3. ## Chemistry

Determine the molar mass of each of the following gases? A. 2.90 g of gas that occupies 0.500 L at 0 C and 1.00 atm (STP) B. 1.48 G of gas that occupies 2.00 L at 0 C and 760 mmHg (STP) C. 0.726g of a gas that occupies 855 mL at 1.20 atm at 18 C? D. 2.32 G
4. ## Chemistry

The molecular weight of an unknown gas is found by measuring the time required for a known volume of the gas to effuse through a small hole, under constant pressure. The apparatus is calibrated by measuring the time needed for the same volume of O2
5. ## Chem

A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas? Thanks!
6. ## science

1. What weight of aluminum may be obtain from 1 kg of aluminum oxide? 2. how many liters of hydrogen would be form by the reaction of 25g of hydrochloric acid and sufficient quantity of zinc? 3. 0.82l of an unknown gas at 35 degree Celsius and 80 cm-Hg
7. ## Chemistry

1. A cylinder of Xenon has a volume of 750. ml. At 25.0°C the cylinder has a pressure of 655 torr. How much Argon is present in the cylinder? a. 240. moles b. 0.0264 moles c. .315 moles d. 26.5 moles 2.If a 25 liter cylinder of gaseous ammonia at
8. ## Chemistry

A 1.44-g sample of an unknown pure gas occupies a volume of 0.336 L at a pressure of 1.00 atm and a temperature of 100.0 degrees Celsius. What is the unknown gas?
9. ## Chemistry

A 1.44-g sample of an unknown pure gas occupies a volume of 0.336 L at a pressure of 1.00 atm and a temperature of 100.0 degrees Celsius. What is the unknown gas?
10. ## Chemistry

A sample of gas collected over water at 42 C occupies a volume of one liter. The wet gas has a pressure of 0.986 atm. The gas is dried, and the dry gas occupies 1.04 L with a pressure of 1.00 atm at 90 C. Using this information, calculate the vapor
11. ## chemistry

What is the molecular weight of an unknown gas if 2.5g of it occupies 2L at 630 torr and a temp. of 600K? 10.2 36.6 74.3 28.9 40.1
12. ## Chemistry

"The analyzer said that at 20degreesC the unknown gas was 82.8% carbon by weight and 17.2% hydrogen. The analyzer also diffused the gas through a special apparatus and measured the rate of its diffusion compared to how fast oxygen gas diffused under the
13. ## Chemistry

"The analyzer said that at 20degreesC the unknown gas was 82.8% carbon by weight and 17.2% hydrogen. The analyzer also diffused the gas through a special apparatus and measured the rate of its diffusion compared to how fast oxygen gas diffused under the
14. ## Chemistry

A sample of hydrogen gas (H2) was found to effuse at a rate equal to 6.7 times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol. Express your answer to one (tenth) decimal place.
15. ## Chem

In a molecular weight determination, a volume of an unknown gas effused through a small opening in 40 seconds while the same volume of O2 required only 20 seconds for effusion. Calculate the molecular weight of the unknown gas.
16. ## Chemistry

An unknown amount of gas occupies 30.0 L at 2.1 ATM and 298K. How many moles does the sample contain? What is the mass if the gas is helium? What is the mass if the gas is argon?
17. ## Chemistry

An unknown amount of gas occupies 30.0 L at 2.1 atm and 298K. How many moles does the sample contain? What is the mass if the gas is helium? What is the mass if the gas is argon?
18. ## Chemistry

An unknown amount of gas occupies 30.0 L at 2.1 atm and 298K. How many moles does the sample contain? What is the mass if the gas is helium? What is the mass if the gas is argon?
19. ## chemistry

If 48.3 g of an unknown gas occupies 10.0 L at 40 degrees celsius and 3.10 atm, what is the molar mass of the gas?
20. ## chemistry

if 48.3 g of an unknown gas occupies 10.0 L at 40 degrees celsius and 3.10 atm, what is the molar mass of the gas?
21. ## Chemistry

A gas mixture is made by combining 7.2 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 14.30 L. What is the molar mass of the unknown gas? Identify the unknown gas.
22. ## Chemistry

Calculate the molecular weight of a gas if 16.8 g of the gas occupies 16.3 L at STP.
23. ## chemistry

If 2.25g of a gas occupies 1750mL at 180 degrees Celsius and 550mm Hg of pressure, what is the molecular weight of the gas?
24. ## chemistry

A 1.20-L container contains 1.10 g of unknown gas at STP.What is the molecular weight of the unknown gas?
25. ## chem3A

7.34 grams of a gas occupies a volume of 2.5 liters at a pressure of 1216. mm and a temperature of 73 degrees celsius. What is the molecular weight of the gas?
26. ## Chem

A chemist was asked to find the molecular mass of a gas. She massed the gas and found that 3.73 g of the gas occupied 300 cm3 at 25°C and 92.4 kPa. What is the molecular weight of the gas?
27. ## Chemistry (pressure)

8 grams of C3H4 gas occupies a volume of 8.2 L at 300 K temperature. Assume ideal gas behavior. The ideal gas constant is 0.082 (L·atm)/(K·mol), and the molecular mass of C3H4 is 40 g/mol. How much pressure is the gas applying to the walls of its
28. ## Chemistry

If 500 mol of hydrogen gas occupies 5.00L at 25 celsius, what is the pressure in atm? I believe this is Ideal gas law. I can't figure out how to put it in the PV=nRT.
29. ## chemistry

If 4.83 mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23 mL of argon, Ar, to effuse through the same hole under the same conditions, what is the molecular weight of the unknown gas?
30. ## Chemistry

An unknown gas has a molecular weight of 30.07 g/mol. What is the density of the gas at STP?
31. ## AP Chemistry

The rate of effusion of unknown gas X is found to be about 1.5 times that of SF6 gas (MW=146 g/mol) at the same conditions of temperature and pressure. What is the molecular weight of gas X? Answer in units of g/mol
32. ## Chemistry

A quantity of N2 occupies a volume of 1 L at 290 K and 1.5 atm. The gas expands to a volume of 2.7 L as the result of a change in both temperature and pressure. Find the density of the gas at these new conditions (in grams per liter).
33. ## Chemistry

It is found that an unknown gas has a density of 2.5 times that of Oxygen gas of the same Temperature and Pressure. What is its molecular weight?
34. ## Chemistry

A student performed an experiment to determine the molecular weight of a gaseous compound. Using the ideal gas law PV = nRT, and knowing the pressure, temperature, and volume of the vapor, the student calculated the number of moles of gas, n, to be 0.0443
35. ## Chemistry

An unknown gas is placed in a 1.500 L bulb at a pressure of 356 mm Hg and a temperature of 22.5 ∘C, and is found to weigh 0.8108g .What is the molecular mass of the gas?
36. ## Chem 101

A 5.00 liter sample of gas measured at 27 degrees Celcius and 1.25 atm of pressure has a mass of 10.13 grams. What is the molecular weight of the gas in u?
37. ## Physics Urgent

A container of volume V = 103 cm3 has a mass of 30.0042 g when evacuated. When the container is filed with an unknown gas of pressure p = 4.72 atm at temperature T = 20oC, the mass of the system increases to 30.9508 g. Assuming that the unknown gas behaves
38. ## Physics Urgent

A container of volume V = 103 cm3 has a mass of 30.0042 g when evacuated. When the container is filed with an unknown gas of pressure p = 4.72 atm at temperature T = 20oC, the mass of the system increases to 30.9508 g. Assuming that the unknown gas behaves
39. ## Chemistry

Determine the atomic weight of X in the following compounds a)8g XH4 occupy 44.8L volume at 237C and 380 mmHg pressure b)1.92g of X3 occupis a volume of 574 ml at 77C and 2 atm c)A O.326 gram of gas,C3X4 has a volume of 250 ml at100C and 76 cmHg d)A 3.12
40. ## Chemistry

In the Haber-Bosch process, nitrogen and hydrogen gas are reacted under high temperature 500 degrees C and pressure 200 atm to form ammonia gas (NH3) according to the following equation: N2+3H2 = 2NH3 If 9300 L H2 gas is reacted with an excess of N2 gas at
41. ## science

A fixed quantity of gas at 22°C exhibits a pressure of 739 torr and occupies a volume of 5.46 (a) Calculate the volume the gas will occupy if the pressure is increased to 1.74 atm while the temperature is held constant.
42. ## Chemistry

a sample of gas of unknown pressure occupies 0.766 L at the temperture of 298k the same sample of gas is than tested under known conditions and has the pressure of 32.6kPa and occupies 0.664 L at 303 k. What is the original pressure of gas
43. ## Chemistry. CONVENT

An unknown gas shows a density of 2.39 gms per litre at 100 degrees centigrade and 715 mm presure. Wht is the gram molecular weight of the gas
44. ## chemistry

A sample of unknown gas weighs 2.96 g and occupies 750. mL at 760. mmHg and 100.°C. What is the molar mass of the unknown gas?
45. ## chemistry

At 22 degrees Celsius and a pressure of 755 mm Hg, an unknown gas was found to have a density of 4.52 g/L. When analyzed, the gas was found to consist of two elements: Boron at 78.1% and Hydrogen at 21.9%. What is the molecular formula of this unknown gas?
46. ## Chemistry

I don't understand how to answer this questions. I thought molecular weight was adding up the atomic weight of each element in a molecule...? If a 0.614g sample of a gas maintains a pressure of 238 mmHg when contained in a 1.0L flask at 0.0 degree Celcius,
47. ## Chemistry

A sample of gas is confined to a cylinder housed with a movable piston. Initially, the gas occupies a volume of 2.7 L at 6.0 atm and 25°C. Calculate the volume of the gas sample if the pressure is reduced to 1.8 atm and the temperature decreased to 20°C.
48. ## Chemistry

An ideal gas differs from a real gas in that the molecules of an ideal gas: have no kinetic energy have a molecular weight of zero have no attraction for one another have appreciable molecular volumes have an average molecular mass I believe the answer is
49. ## Chemistry

A 0.642 g sample of an unknown gas was collected over water at 25 C and 1.04 atm. The collection cylinder contained 151.3 mL of gas after the sample was released. Find the molar mass of the unknown gas?
50. ## chemistry

0.82g of an unknown gass is at 30 degrees C in 3L container at a pressure of 15.9psi. What is the molecular weight of the unknown gas?
51. ## chemistry

In an effusion 15 ml of HBr effused in 1.0 min. In the same apparatus under the same conditions, 20.3 ml of an unknown gas diffused in 1.0 min. If the unknown contains only carbon and hydrogen. determine the molecular formula of the unknown gas,
52. ## Chemistry

1.05 g of an unknown gas at 47 °C and 1.05 atm is stored in a 2.25-L flask. Density of the gas= 0.47g/L What is the molar mass of the gas?
53. ## chemistry

3. Another volatile liquid was used in a similar experiment. A student found that 0.32 g of vapor had a volume of 152ml at 100 celsius and 1 atm. What was the molar mass of this gas? 4. The empirical formula of the unknown gas in question 3 is CH4O. What
54. ## Chemistry

3.15 g of an unknown gas at 53 °C and 1.00 atm is stored in a 1.55-L flask. The gas has a density of 2.03 g/L. What is the molar mass of the gas?
55. ## chem

1.45 g of an unknown gas at 53 °C and 1.10 atm is stored in a 1.85-L flask. What is the density of the gas what is the molar mass of the gas
56. ## Chemistry

A gas occupies a volume of 0.500L at 125 degrees Celsius and 0.443 atm. What mathematical expression will yield the correct temperature at 0.750 L and 0.689 atm? Is it the combined gas law of P2V1/T1=P2V2/T2?
57. ## Chemistry

nitrogen gas is at 2.00. c, 2.00 atm pressure and occupies a volume of 10.01. Assume nitrogen is an ideal gas, how many moles of the gas are present?
58. ## chemistry

Question: Consider this molecular-level representation of a gas. There are: 5 orange gas particles 6 blue gas particles 3 green molecules of gas (two particles attached together) If the partial pressure of the diatomic gas is 0.510 atm, what is the total
59. ## science

'Imagine there is a tank of unknown gas that contains 53.31% carbon, 11.18% hydrogen, and 35.51% oxygen by mass. At 35.0 °C and 0.455 bar, 2.00 L of the gas has a mass of 3.20 g. Using this information, answer the following questions. a.) What is the
60. ## Chem Ideal Gas Law

A 1.05 g sample of an ideal gas occupies 1.045 L at 20.0°C and 0.975 atm. What will be its volume at -8.6°C and 0.5 atm? I used PV=nRT for this. substituted P for 0.5 then n for 1.05, R .0821 then T for 264.4 K After doing this I got .0219 but it is
61. ## chemistry

If 0.385 g of gas occupies a volume of 200 mL at -73 oC and 750 torr, what is the molecular mass of the gas? a) 21.4 b) 32.0 c) 44.0 d) 48.0 Someone can help me this answer please..?
62. ## Chemistry- partial pressures

A sample of gas collected over water at 42 degrees C occupies a volume of one liter. The wet gas has a pressure of .986 atm. The gas is dried and the dry gas occupies 1.04 L with a pressure of 1.00 atm at 90 degrees C. Using this information, calculate the
63. ## Chemistry

A gas, Y, diffuses 1.05 times faster than SO2 gas at the same conditions. What is the molecular weight of gas Y?
64. ## Chemistry

A sample of gas at 47°C and 1.03 atm occupies a volume of 2.20L. What volume would this gas occupy at 107°C and 0.789 atm?
65. ## Chemistry

A 500 mL flask has a measured volume of 586.0 mL. A 0.608g sample of an unknown vapor occupies the flask at 373K at a pressure of 0.981atm. Assume the vapor behaves ideally. What is the molecular weight of the unknown vapor?
66. ## chemistry

If 0.385 g of a gas occupies a volume of 200mL at minus 73 degrees C and 750 torr, what is the molecular mass of the gas?
67. ## Chemistry

A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25-g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at -4.00°C. Which of these choices is its molecular formula?
68. ## Science

10. You analyze the gas in 100 kg of gas in a tank at atmospheric pressure, and find the Following : CO2;19.3%, N2;72.1%, O2;6.5%, H2O;2.1% What is the average molecular weight of the gas?
69. ## chemistry

It was found that argon effused through a membrane in 24 hours, and an unknown gas diffused through the same membrane in 22.1 hours. What was the molecular weight of the gas?
70. ## Chemistry

A sample of gas at 47 C and 1.03 atm occupies a volume of 2.20 L. What volume would this gas occupy at 107 C and 0.789 atm?
71. ## chemistry

a gas occupies 37.6 L at 2.00 atm pressure and 27C degrees. how many moles of gas are present in this sample
72. ## Chem

If 4.0 grams of hydroven, 6.02 x 10^22 atoms of helium and 4.48 liters of argon, measured at STP are placed in a 2.0 liter flask, at 27 degrees C, what is the final pressure? Under controlled conditions the velocity of hydrogen molecules was found to be
73. ## Chemistry

A sample of krypton gas occupies 95.0 mL at 0.500 atm. If the temperature remained constant, what volume would the krypton occupy at (a) 5.00 atm, (b) 0.0500 atm, (c) 555 torr, (d) 5.00 torr, and (e) 5.5 3 1022 torr?
74. ## chemistry

17 liters of a gas is at an initial temperature of 67 degrees C and a pressure of 88.89 atm, what will be the pressure of the gas if the tempetature of the gas is raised to 94 degrees C and the volume of the gas is decreased to 12 liters? 177 atm 36.3 atm
75. ## Chemistry

If a nitrogen gas sample occupies a volume of 2.55 L at 22.0 degrees Celsius and 0.860 atm, what is the mass of the N2 gas?
76. ## Chemistry

I need help with part b here's all information. (a) Chlorine gas is added to a glass cylinder of 2.5 cm in radius, fitted with a movable piston. Gas is added until the piston is lifted 5 cm off the bottom of the glass. The pressure on the gas is 1 atm, and
77. ## Chemistry

A gas occupies 56.44 L at 2.00 atm and 310 K. If the gas is compressed to 23,520 mL and the temperature is lowered to 281 K, what is the new pressure in torr?
78. ## CHEMISTRY

A quantity of N2 occupies a volume of 1.5 L at 300 K and 1.2 atm . The gas expands to a volume of 3.2 L as the result of a change in both temperature and pressure.
79. ## Chemistry

I'm having trouble trying to figure out how to setup and solve these problems: 1) 2,600.0 mL of air is at 20.0C. What is the volume at 60.0C? 2) A gas occupies 900.0 mL at a temperasture of 27.0C. What is the volume at 132.0C? 3) What change in volume
80. ## chemistry

please can someone help me with these questions? 24) Which represents the largest pressure? A) five mm Hg B) one atmosphere C) one millimeter of mercury D) one hundred pascals E) five pounds per square inch 25) What would be the new pressure if a 400 mL
81. ## Chemistry

A 0.02847 g sample of gas occupies 10.0-mL at 292.0 K and 1.10 atm. Upon further analysis, the compound is found to be 38.734% C and 61.266% F. What is the MOLECULAR formula of the compound?
82. ## Chemistry

An unknown gaseous hydrocarbon consists of 85.63% carbon by mass. A 0.335 g sample of the gas occupies a volume of 0.107 L at STP. What is the identity of the gas?
83. ## Chemistry

A pocket of gas is discovered in a deep drilling operation. The gas has a temperature of 480c and is at a pressure of 12.8 atm. What volume of gas is required to provide 18.0 L of gas at the surface where the conditions are 22 C and 1.00 atm?
84. ## (chem) this will make me or break me :(

1.If the pressure of the gas in a 2.31 L balloon is 0.120 atm and the volume increases to 7.14 L, what will be the final pressure of the air within the balloon? Round to the nearest hundredth. Don't forget the units. 2.At a pressure of 2 atm, hydrogen gas
85. ## chem ! help its killing me to :/

1.If the pressure of the gas in a 2.31 L balloon is 0.120 atm and the volume increases to 7.14 L, what will be the final pressure of the air within the balloon? Round to the nearest hundredth. Don't forget the units. 2.At a pressure of 2 atm, hydrogen gas
86. ## (1-13) Chemistry - Science

Which of the following effects will make the ratio (PV) / (nRT) less than 1 for a real gas? a) The gas molecules are large enough to occupy a substantial amount of space. b) A large number of molecules have speeds greater than the average speed. c) The gas
87. ## Chemistry

Chlourine monoxide reacts with flourine gas to give a new unknown gas that contains Cl, O and F. In an experiment you find that 0.15476 g of the new gas has a preasure of 17mmHg ina 1850 mo flak at 21ºC. What is thd identity of the unknown gas?
88. ## Chemistry

A 0.02847 g sample of gas occupies 10.0-mL at 292.0 K and 1.10 atm. Upon further analysis, the compound is found to be 38.734% C and 61.266% F. What is the molecular formula of the compound? __________________?
89. ## college chem

A sample of methane gas CH4, occupies a volume (L) of 58.2 L at a pressure of 7.25 atm. What volume will the gas occupy if the pressure is lowered to 2.03 atm
90. ## chemistry

A sample of oxygen at room temperature occupies a volume of 500. L at 1.75 atm. What would be the volume of this gas at 2.50 atm at the same temperature?
91. ## PHYSICS (REALLY DIFFICULT PLEASE HELP)

At a temperature of 18.0°C of 23.0cm^3 of a certain gas occupies has pressure of 103 kPa. (a) What volume would the gas occupy at a temperature of 0.00°C and pressure of 101kPa? (b) 1.00 moles of a certain gas occupies a volume of 22.4 litres at 0.00°C
92. ## PHYSICS (PLEASE HELP ME ASAP)

At a temperature of 18.0°C of 23.0cm^3 of a certain gas occupies has pressure of 103 kPa. (a) What volume would the gas occupy at a temperature of 0.00°C and pressure of 101kPa? (b) 1.00 moles of a certain gas occupies a volume of 22.4 litres at 0.00°C
93. ## Physical Science

A chemist is investigating an unknown gas. She observes that it combines with oxygen. It takes two liters of oxygen to fully react with one liter of the unknown gas, and that the resulting volume of gas is also two liters. What does she conclude? A.) The
94. ## chemistry

one mole of a gas occupies 27.0 liters, and its density is 1.41g/l at a particular temperature and pressure. what is its molecular weight? What is the density at STP?
95. ## chemistry

Temp - 650 Pressure - 760mm Hg mass - 0.927g volume - ? I need to work out the volume I know that Pv=nRT but I just can't figure this out. I've been told the answer is 176cm3 but I don't get that. Can someone please explain this to me. You don't have
96. ## Chem hw!

1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas
97. ## Chem hw!

1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas
98. ## Physics

Initially 1.200 mol of an ideal gas in a container occupies a volume of 3.50 l at a pressure of 3.30 atm with an internal energy U1 = 547.2 J. The gas is cooled at a constant volume until its pressure is 1.80 atm. Then it is allowed to expand at constant
99. ## physics

Initially 1.200 mol of an ideal gas in a container occupies a volume of 3.50 l at a pressure of 3.30 atm with an internal energy U1 = 547.2 J. The gas is cooled at a constant volume until its pressure is 1.80 atm. Then it is allowed to expand at constant
100. ## Chemistry

A quantity N2 of occupies a volume of 1.4L at 290K and 1.5atm . The gas expands to a volume of 3.1 L as the result of a change in both temperature and pressure. I have the find the density of the gas at these new conditions?