A gas sample contains 78.14% boron and 21.86% hydrogen. Gas, which is 0.0743 L at 27oC, pressures 1.12 atm. If the weight of the gas is 0.0938 g, what is the molecular formula of the gas? (B: 10.81g / mol, H: 1.01g / mol, R: 0.082L.atm / mol.K)

Q: A 1.35 g sample of an unknown gas at 43 ∘C and 1.10 atm is stored in a 1.45 L flask. What is the…

A: The density is calculated by using given mass and volume.

Q: A mixture of 0.220 moles Rn, 0.350 moles O2 and 0.640 moles Ar (all in the gaseous state) has a…

A: Given data Number of moles of Rn = 0.220 moles Number of moles of O2 = 0.350 moles Number of moles…

Q: A piece of dry ice (solid carbon dioxide) with a mass of 5.50 g is placed in a 10.0 L vessel that…

A: Total pressure :- 1.233 atm

Q: At 0 degrees C, a 1.0-L flask contains 5.0×10−2 mol N2, 1.5×102 mg O2, and 5.0×1021 molecules of…

A: Given, volume of flask V =1.0 Ltemperature T =0°C =273.15 Knumber of moles of N2 =5.0×10-2 mol =0.05…

Q: At 0°C a 1.0-L flask contains 2.0*10^-2 mole of N2, 2.0*10^2 mg and 4.6*10^21 molecules of NH3. What…

A: Let us consider that the flask contains 2x10-2 N2 moles, 2x102 mg of O2 and 4.6x1021 NH3 molecules.…

Q: If a gaseous mixture is made by combining 1.33 g Ar and 2.47 g Kr in an evacuated 2.50 L container…

A: When amount of Ar and Kr are added, volume remains same. So, sum of partial pressure of each gas is…

Q: A 2.85 g sample of an unknown gas at 37 °C and 1.00 atm is stored in a 1.05 L flask. What is the…

A:

Q: At 1°C a 1.0-L flask contains 5.0 x 10 ^-2 mole of N2, 4.0 x 10^2 mg O2 , and 3.1 x 20^21 molecules…

A:

Q: A 3.35 g sample of an unknown gas at 23 C and 1.10 atm is stored in a 3.05 L flask. What is the…

A:

Q: A fire extinguisher releases 1.96 g of an unknown gas that occupies 1.00 L at STP. What is the molar…

A: Given that:                                   Mass of the unknown gas = 1.96 g…

Q: A 2.55 g sample of an unknown gas at 31 ∘C and 1.05 atm is stored in a 2.85 L flask. What is the…

A: First the density is determined by using density formula as shown below,

Q: Calcium carbonate, CaCO31s2, the principal compound in limestone, decomposes upon heating to CaO(s)…

A: Given, P = 1.3 atm V = 250 mL T = 310C

Q: If 1.04 g Ar are added to 4.83 atm He in a 2.00 L cylinder at 27.0 °C, what is the total pressure of…

A: We have to calculate the total gas pressure of mixture.

Q: A 1.92 L flask is filled with 2.52 g of some gas (molar mass 42.100g/mol) at 23.1°C. A different…

A: Given: Volume , V = 1.92 L Temperature = 23.1°C = 296.25K No. Of moles gas= 2.52g/42.1gmol-1= 0.0598…

Q: A 9.80 L container holds a mixture of two gases at 51 °C. The partial pressures of gas A and gas B,…

A: According to Dalton’s law of partial pressure, in a gaseous mixture, the partial pressure of a…

Q: A 5.73-L flask at 25 °C contains 0.0388 mol of N2, 0.147 mol of CO, and 0.0803 mol of H2. What is…

A: The ideal equation for gas is given by,                                               PV = nRT…

Q: After dissolving an unknown tablet in water, the tablet dissolves and liberates a gas. Suppose at 1…

A: Given that:            Volume of gas (V) = 360 mL = 0.360 L               Temperature (T) = 20℃ =…

Q: A study of the effects of certain gases on plant growth requires a synthetic atmosphere composed of…

A: (a)Mole fraction = (mole %) / 100 Partial pressure = mole fraction × total pressure Mole fraction of…

Q: If 3.47 g Ar are added to 4.74 atm He in a 2.00 L cylinder at 27.0 °C, what is the total pressure of…

A: The pressure exerted by Ar is, PV = nRTP = nRTV ......(1) No. of moles of Argon = 3.47g/(40gmol-1) =…

Q: 4. The decomposition of 30.354 g of potassium chlorate yields solid potassium chloride and oxygen…

A: 2KClO3 → 2KCl (s) + 3O2Mass of KClO3= 30.354gT= 27.05°C   = (27.05+273.15)K     = 300.2KP= 1.075…

Q: What is the temperature, in K, of a 1.0 mole sample of gas that initially had a pressure of 1.01…

A: The final pressure in the atm is determined as follows. P2=767.6 torrP2=767.6 torr760 torr/atm=1.01…

Q: A 3.55 g sample of an unknown gas at 59 °C and 1.05 atm is stored in a 1.05 L flask. What is the…

A: a) Since mass of gas is given = 3.55 g  and volume of gas = volume of flask = 1.05 L hence density…

Q: A gas mixture contains He, Ne, and H2S at partial pressures of 125, 175, and 225 mm Hg,…

A: Interpretation -  To determine the partial pressure in the milliliters of mercury of Ne when a…

Q: If a gaseous mixture is made by combining 2.17 g Ar and 2.55 g Kr in an evacuated 2.50 L container…

A:

Q: A gas sample weighing 19.66 g occupies a volume of 7.85 L at STP. What is the molar mass of this gas…

A: The ideal gas equation is given as:

Q: A 1.95 g sample of an unknown gas at 67 °C and 1.05 atm is stored in a 2.05 L flask. What is the…

A: The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by…

Q: When gaseous F2 and solid Iz are heated to high temperatures, the Iz sublimes and gaseous iodine…

A: Charle's law: P1T1=P2T2

Q: If 4.81 g Ar are added to 4.01 atm He in a 2.00 L cylinder at 27.0 °C, what is the total pressure of…

A: First Calculate mole of Ar by mass÷molar mass Then Mole of He by PV=nRT. After this for total…

Q: The mole fraction of CH4 in a mixture of gases is 0.285 with a partial pressure of 0.498 atm. What…

A: The total pressure of a mixture of gases not reacting with each other is equal to the sum of partial…

Q: 2. A 0.500 g impure sample of LINO; is heated, causing it to decompose according to the following…

A: Given temperature = 300 K. 1 atm = 760 mm Hg. The pressure of the dry gas = 760 – 26.7 =733.3 mm Hg.

Q: A large flask with a volume of 936 mL is evacuated and found to have a mass of 134.66 g. It is then…

A:

Q: A 1.75 g sample of an unknown gas at 47 C and 1.00 atm is stored in a 1.85 L flask. What is the…

A:

Q: 0.125 g of Neon is in a 225.0 ml flask at 22.5°C. Determine the pressure in the flask in atm and in…

A: Given: Mass of Neon = 0.125 g Molar mass of Neon = 20.1797 g/mol Volume = 225.0 mL = 0.225 L…

Q: Calcium carbonate, CaCO3(s), the principal compound in limestone, decomposes upon heating to CaO(s)…

A: Given, P = 1.3 atm V = 250 mL T = 310C

Q: An unknown gas has a density of 1.71 g/L at 755 mm Hg, 25°C. How many moles of unknown gas are…

A:

Q: In a flask of fixed volume, 4 moles of A3(g) are mixed with 6 moles of B2(g) anc the gases react to…

A: Write the balanced chemical equation for the given reaction. Then draw the number of moles relation…

Q: Three 1.00 L flasks at 25.0 °C and 1013 kPa pressure contain: CH4 (flask A), CO2 (flask B) and NH3…

A: The volume, temperature and pressure of three flasks (flask A, flask B and flask C) is 1.00 L,…

Q: A 4.17 g4.17 g sample of NH3NH3 gas and a 4.17 g4.17 g sample of HClHCl gas are mixed in a 2.00…

A: GIVEN: NH3 gas sample =  4.17 g HCl gas sample = 4.17g Volume of flask =2.00 L Temperature=25oC To…

Q: A 4.00-g sample of a mixture of CaO and BaO is placed in a1.00-L vessel containing CO2 gas at a…

A: First we have to calculate the reacted pressure of CO2 gas in the given reaction:- The initial…

Q: • A sample of helium gas in a ballon is compressed from 4.0 L to 2.5 L at a conštant temperature. If…

A:

Q: If 4.68 g Ar are added to 4.09 atm He in a 2.00 L cylinder at 27.0 °C, what is the total pressure of…

A: no of moles Ar=4.6840                      =0.117no of moles of He , under given conditionAssuming…

Q: 87.23 grams of a gas occupies 45 L at 600 mm Hg and 25 C. What is the molar mass of the gas ?

A:

Q: Consider four 1.0 L flasks of gases at STP, Flask A contains NO gas, Flask B contains NH3 gas, Flask…

A:

Q: A 3.75 L sample of gas from a chemical plant is collected and analyzed st 25 degrees celisus. It is…

A: The number of moles for a given chemical species refers to the ratio of mass of the species to that…

Q: Assume that an exhaled breath of air consists of74.8% N2, 15.3% O2, 3.7% CO2, and 6.2% water…

A: a) Calculation of partial pressure of each gas: Partial fraction=Mole…

Q: At 450 mm Hg and 85oC, a sample of carbon monoxide gas occupies a volume of 0.250 L. The gas is…

A: Given, P1 = 450 mm Hg = 0.59 atm P2 = ? V1 = 0.250 Litre V2 = 2.00 Litre T1 = 85 + 273 = 358…

Q: The gas from a certain volcano had the following composition in mole percent: 65% CO2, 25% H2, 5.4%…

A: According to Dalton's law of partial pressure the total pressure of a gaseous mixture is the sum…

Q: 4. If 5.0 g of O, and 3.0 g of N, are placed in a 30.0L tank at a temperature of 25°C, what will the…

A:

Q: 4. What volume would be occupied by a gas that has a pressure of 0.950atm if its volume was 1.50L at…

A: Given: Case I:Volume of gas, V1= 1.50LPressure of gas,P1=1.16 atmCase II:Volume of gas, V2=…

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.