A conical flask has a volume of 71.9 mL. It is filled with water vapour at a pressure of 1053.8 kPa and a temperature of 738 K. Determine the mass of
water in the conical flask.
Select one:
O a. 0.363 g
O b.0.183 g
O c.0.129 g
O d. 0.222 g
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Ответ:
d. 0.222 g
Explanation:
Given parameters:
volume of water = 71.9mL = 0.0719L
pressure = 1053.8kPa = 10.4atm
temperature = 738K
Unknown:
mass of water = ?
Solution:
To find the mass of water, we need to obtain the number of moles from the given parameters.
This can be done using the ideal gas law;
PV = nRT
where P is the pressure
V is the volume
n is the number of moles
R is the gas constant
T is the temperature
Input the parameters to find n;
10.4 x 0.0719 = n x 0.082 x 738
n = 0.012moles
Mass of water vapor = number of moles x molar mass
molar mass of H₂O = 2 + 16 = 18g/mol
Mass of water vapor = 0.012 x 18 = 0.22g
Ответ:
D i think I hope this helps