What is the mass of neon that exerts a pressure of 720. mmHg, with a temperature of -15.0 °C , when the volume of the container is 760. mL?
A)0.0340 g
B)0.615 g
C)0.686 g
D)517 g
E)25.8 g

Question

Quizplus · Accepted Answer

The first step is to convert the pressure and temperature to the correct units:
- 720. mmHg = 0.947 atm
- -15.0°C = 258.15 K
Next, we can use the ideal gas law to solve for the mass of neon:
PV = nRT
n = PV/RT
n = (0.947 atm)(0.76 L)/(0.0821 L*atm/mol*K)(258.15 K)
n = 0.0340 mol
Now, we can use the molar mass of neon (20.18 g/mol) to find the mass:
mass = (0.0340 mol)(20.18 g/mol)
mass = 0.686 g
Therefore, the best choice is C.

What Is the Mass of Neon That Exerts a Pressure