Answer:
To calculate the number of moles of neon gas, we can use the ideal gas law equation:
PV = nRT
where:
P = pressure (in atm)
V = volume (in L)
n = number of moles
R = gas constant (0.0821 L·atm/mol·K)
T = temperature (in K)
We need to convert the given temperature from Celsius to Kelvin by adding 273.15:
25 °C + 273.15 = 298.15 K
Now we can plug in the values and solve for n:
(1.2 atm) (2 L) = n (0.0821 L·atm/mol·K) (298.15 K)
Simplifying the equation:
n = (1.2 atm x 2 L) / (0.0821 L·atm/mol·K x 298.15 K)
n = 0.097 mol
Therefore, there are 0.097 moles of neon gas in a 2 L tube at 25 °C and 1.2 atm.