Question

can you answer both questions please. TIA

In this lab, you will start off by calculating the number of moles of air molecules inside a flask containing 10 mL of water by cooling the flask down to near 0°C and assuming the vapour pressure of water is negligible at that temperature If the volume of the air inside the flask is 148.2 ml, the gas pressure sensors reads 99.6 kPa and the temperature sensor reads 2.7 °C, how many moles of air molecules are present in the flask? Express your answer in mol. Assume R = 8.314 J mol? K1 Answer:

Answer 1

0 T = 207°C = 275.7 K love V 148.2 mL = 0.1482 x 10-3 m² P = 99.6 kPa = gg.681603 N/m2 R= 8.314 Tlmol-K PV lurrit n = RTI Sn 9 9•6X10° Ñ X 0.1482x10-3 m. 8.314 I , % 27507 K molk : n = 6.43.96 810-3 mol II Nom ] air & no. of molecules of tonosoft moles.cn) & 6.022 x 10 s H = 6.43.968. 10-3 & 6.022 x 1023 on 2 3807792 x 1020 3 LO 3.87792 X molecules

ci in P = Hval & corte RT - 10p ņ y=mat c a Slope cm) = - Strap O IS IT = - 3116 K (Kelvin) – 3116k - Strap 8. 314 J/mol-K 3 Ilmol Ohhap = 31164 8.314 - 25906.424 Ilmol Hvap = 25.906 K Tlmol.