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Determine the number of moles of gas contained in each of the following:

a. 1.25 L at 250.0 K and 1.06 atm

b. 0.80 L at 27°C and 0.925 atm

c. 7.50 102 mL at -50.0°C and 0.921 atm​

Respuesta :

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(a) The number of moles of gas for first case is 0.065 mol.

(b) The number of moles of gas for second case is 0.03 mol.

(c) The number of moles of gas for third case is 0.038 mol.

Number of moles of the gas

The number of moles of the gas is determined by applying ideal gas equation as follows;

PV  = nRT

n = PV/RT

where;

  • R is gas constant = 0.082057 L.atm/mol.K

For 1.25 L at 250.0 K and 1.06 atm

n = (1.06 x 1.25) / (0.082057 x 250)

n = 0.065 mol.

For 0.80 L at 27°C (300 K) and 0.925 atm

n = (0.8 x 0.925) / (300 x 0.082057)

n = 0.03 mol

750 mL at -50.0°C (223 K) and 0.921 atm​

n = (0.75 x 0.921)/(223 x 0.082057)

n = 0.038 mol

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