PROBLEM SET #4 Answer true or false. (a) Avogadro’s law states that equal volumes of gas at the same temperature and pressure contain equal numbers of molecules. (b) At STP, one mole of uranium hexafluoride (UF6 , MW 352 amu), the gas used in uranium enrich- ment programs, occupies a volume of 352 L. (c) If two gas samples have the same temperature, volume, and pressure, then both contain the same number of molecules. (d) The value of Avogadro’s number is 6.02 3 1023 g/mol. (e) Avogadro’s number is valid only for gases at STP.
PROBLEM SET #4
Answer true or false.
(a)
(b) At STP, one mole of uranium hexafluoride (UF6 , MW 352 amu), the gas used in uranium enrich- ment programs, occupies a volume of 352 L.
(c) If two gas samples have the same temperature, volume, and pressure, then both contain the same number of molecules.
(d) The value of
(e) Avogadro’s number is valid only for gases at STP.
(f) The
(g) When using the ideal gas law for calculations, temperature must be in degrees Celsius.
(h) If one mole of ethane sCH3 CH3 d gas occupies 20.0 L at 1.00 atm, the temperature of the gas is 244 K.
(i) One mole of helium (MW 4.0 amu) gas at STP occupies twice the volume of one mole of hydrogen (MW 2.0 amu).
- A sample of a gas at 77°C and 1.33 atm occupies a volume of 50.3 L.
(a) How many moles of the gas are present?
(b) Does your answer depend on knowing what gas it is?
- What is the volume in liters occupied by 1.21 g of Freon-12 gas, CCl2 F2 , at 0.980 atm and 35°C?
- An 8.00-g sample of a gas occupies 22.4 L at 2.00 atm and 273 K. What is the molar mass of the gas?
- What volume is occupied by 5.8 g of propane gas, C3 H8 , at 23°C and 1.15 atm pressure?
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