What is the molecular mass of an unknown gas if 6.5 liters at 75C and 700 mm pressure weigh 30.0 grams?
a. 143 g/mol
b. 121.3 g/mol
c. 87.4 g/mol
d. 54.8 g/mol
e. 30.8 g/mol
What is the molecular mass of an unknown gas if 6.5 liters at 75C and 700...
Experiment 12: Generating Hydrogen Gas Part B: Molar mass of unknown metal Unknown #: Mass of unknown metal (X) .29 Volume of H2 gas L mL Temperature of H; gas 20 mm к C Atmospheric pressure (see barometer) Vapor pressure of water mmHg Partial pressure of H; gas mmHg atm Using PV-nRT and your data, calculate the moles of hydrogen gas produced in the experiment: l e epl8 moles H Convert moles of hydrogen gas to moles of the metal...
A gas mixture is made by combining 6.5 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 12.91 L What is the molar mass of the unknown gas? Identify the unknown gas. Number g/mol OOOOO
A gas of unknown molecular mass was allowed to effuse through a small opening under constant pressure conditions. It required 52 s for 1.0 L of the gas to effuse. Under identical experimental conditions it required 27 s for 1.0 L of O2 gas to effuse. Calculate the molar mass of the unknown gas. (Remember that the faster the rate of effusion, the shorter the time required for effusion of 1.0 L; that is, rate and time are inversely proportional.)...
. 0.275 L of solution is prepared by dissolving 2.50 g of an unknown molecular compound in enough water. The osmotic pressure of this solution is 1.98 atm at 27 °C. (R = 0.08206 L·atm/mol·K) a) Determine the molar mass of the molecular compound. (7 pts) b) If you need to prepare 0.275 L of AlCl3 solution with the same osmotic pressure of the above solution, what mass of AlCl3 (MW = 133.33 g/mol) would you need to weigh out?
A 2.43 gram sample of an unknown gas is found to occupy a volume of 2.03 L at a pressure of 506 mm Hg and a temperature of 39°C. The molecular weight of the unknown gas is g/mol
A 4.62 gram sample of an unknown gas is found to occupy a volume of 1.50 L at a pressure of 989 mm Hg and a temperature of 30°C. The molecular weight of the unknown gas is g/mol.
a. What is the molecular weight of 3.7 g of an unknown gas that occupies 450 mL at 20.0°C and 2.0 atm? The value of R 0.0821 L atm mol K-1 b. Aluminum and oxygen react to form aluminum oxide. How many L of oxygen at 296 K and 1.4 atm of pressure are necessary to form 3.25 g of aluminum oxide?
show work please
5. (2 points) Calcium carbide reacts with water to produce an unknown gas and calcium hydroxide. Suppose a 12.8 g sample of CaC2 in excess water produces 5.21 grams of gas in an evacuated 5.00 L glass bulb, with a pressure of 0.988 atm at 27 °C. What is the molar mass of the unknown gas? CaC2(s) + H20 (1) Ca(OH)2 (aq) + unknown gas a. 26.0 g/mol b. 64.1 g/mol c. 34.5 g/mol d. None of...
A sample of N2 gas is contaminated with a gas (A) of unknown molar mass. The partial pressure of each gas is known to be 200. torr at 25°C. The gases are allowed to effuse through a pinhole, and it is found that gas A escapes at 2 times the rate of N2. The molar mass of gas A is: 56 g/mol 14.01 g/mol 7.00 g/mol 112 g/mol none of these
A 2.54 gram sample of an unknown gas is found to occupy a volume of 1.43 L at a pressure of 989 mm Hg and a temperature of 40°C. The molecular weight of the unknown gas is g/mol. Assume ideal behavior.