If the density of ammonia at lab temp. of 25 deg C = 0.760 g litre -1 and the pressure applied = 0.760 mmHg
Boyle's law (At least I think it's Boyle's law! Could have gotten mixed up on this one) states that, at a constant temperature, the pressure of a fixed mass of gas multiplied by its volume is constant.
therefore,
760 mmHg x (vol at 760 mmHg) = 1000 mmHg x 760 cm3
volume at 760 mmHg = 1000 mmHg x 760 cm3 / 760 mmHg
= 1000cm3
At a constant pressure, the volume of a fixed mass of gas divided by the absolute temperature is also a constant
therefore,
volume at 0 degrees C / 0 deg C = volume at 25 degrees C / 25 deg C = 1000 cm3 /
25 deg c
volume at 0 deg C = 1000 cm3 x 25 deg C/ 25 deg C = 1000 cm3
I think your STP in degrees and mmHg is 25 deg C and 760 mmHg.
I am quite useless at chemistry so if anybody wants to correct this mess then please feel free!!
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