1. Convert units:

* Temperature (T): 95 degrees Celsius to Kelvin: 95 + 273.15 = 368.15 K

* Pressure (P): 748 torr to atmospheres: 748 torr / 760 torr/atm = 0.984 atm

* Volume (V): 263 mL to liters: 263 mL / 1000 mL/L = 0.263 L

2. Ideal Gas Law Equation:

The ideal gas law is: PV = nRT

* P = pressure (atm)

* V = volume (L)

* n = number of moles

* R = ideal gas constant (0.0821 L·atm/mol·K)

* T = temperature (K)

3. Solve for n (number of moles):

n = PV / RT

n = (0.984 atm * 0.263 L) / (0.0821 L·atm/mol·K * 368.15 K)

n ≈ 0.0085 moles

Therefore, there are approximately 0.0085 moles of gas in the flask.