Question

A sample of nitrogen monoxide occupies a volume of 400 mL at 100 °C and 720 mmHg.

What volume will the nitrogen monoxide occupy at STP?

277 mL

395 mL

290 mL

300 mL

Answer 1

The volume of nitrogen monoxide that occupy at STP is= 277 Ml

calculation
The volume is obtained using the combined gas law that is P1V1/T1= P2V2?
Where P1 = 720 MmHg
V1 = 400ml
T1= 100 +273= 373 K
At STP temperature = 273 K and pressure= 760 mm hg
therefore T2= 273 k
p2 = 760 mmhg
V2=?
make V2 the subject of the formula

V2= (T2 ×P1 ×V1)/(P2×T1)

V2 is therefore = (273k x720 mmhg x 400 ml)/(760 mmhg x373K) = 277 Ml