suppose that a 125 ml flask is found to have a total volume of 139 mL. How many moles of vapor will fill this flask at a pressure of 760 Torr and a temperature of 100 C

4.54×10¯³ mole

Explanation:

The following data were obtained from the question:

Volume (V) = 139 mL

Pressure (P) = 760 torr

Temperature (T) = 100 °C

Number of mole (n) =.?

Next, we shall determine convert 139 mL to litre (L). This can be obtained as follow:

1000 mL = 1 L

Therefore,

139 mL = 139 mL / 1000 mL × 1 L

139 mL = 0.139 L

Therefore, 139 mL is equivalent to 0.139 L

Next, we shall convert 760 torr to atm.

This can be obtained as follow:

760 torr = 1 atm

Next, we shall convert 100 °C to Kelvin temperature. This can be obtained as follow:

Temperature (K) = Temperature (°C) + 273

Temperature (°C ) = 100 °C

Temperature (K) = 100 °C + 273

Temperature (K) = 373 K

Finally, we shall determine the number of mole of the vapor as follow:

Volume (V) = 0.139 L

Pressure (P) = 1 atm

Temperature (T) = 373 K

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) =.?

PV = nRT

1 × 0.139 = n × 0.0821 × 373

Divide both side by 0.0821 × 373

n = (1 × 0.139) / (0.0821 × 373)

n = 4.54×10¯³ mole

Therefore, 4.54×10¯³ mole of vapor will fill the flask.

bcde is the incorrect answer it is a