You can't determine the amount of gas (in grams or moles) with just the volume, temperature, and pressure. You need one more piece of information: the identity of the gas.

Here's why:

* Ideal Gas Law: The relationship between volume (V), pressure (P), temperature (T), and the amount of gas (n) is described by the Ideal Gas Law: PV = nRT

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

* Molar Mass: To convert the amount of gas (n) in moles to mass (in grams), you need the molar mass (g/mol) of the gas. Each gas has a unique molar mass.

Here's how to solve the problem if you know the identity of the gas:

1. Convert units:

* Convert temperature to Kelvin: 68°C + 273.15 = 341.15 K

* Convert pressure to atmospheres: 672 mmHg / 760 mmHg/atm = 0.884 atm

2. Use the Ideal Gas Law:

* Rearrange the equation to solve for n: n = PV/RT

* Plug in the values: n = (0.884 atm)(36.52 L) / (0.0821 L·atm/mol·K)(341.15 K)

* Calculate the number of moles (n)

3. Find the mass:

* Multiply the number of moles (n) by the molar mass of the gas to get the mass in grams.

Example:

Let's say the gas is oxygen (O₂). The molar mass of oxygen is 32.00 g/mol.

1. You would calculate the number of moles (n) as described above.

2. Then multiply the number of moles by 32.00 g/mol to find the mass of oxygen in grams.

Let me know the identity of the gas, and I can calculate the amount for you!