Below are some conversions.
336.715 m/s
1212.175 km/h
753.206 mph
1104.709 ft/s
654.08 knots
Try using this website:
www.sengpielaudio.com/calculator-speedsound.htm
This can be solved using the Combined Gas Law. The formula for that is

Let's go ahead and fill in our known values. Since pressure remains the same, it doesn't matter what number we use, so let's assume 1 atm on both sides. For temperature, remember to convert it to Kelvin first (K = C + 273).

Go ahead and simplify both sides.
0.001238 = 
Multiply both sides by 573.
0.7095 = x L
So, at 300° C, your gas will occupy 0.7095 L.
I think the word your looking for is procedure