Which of the following statements about vapor pressure is FALSE?

Give the definition for Effusion.

What is the bond angle in a generic AX4 molecule  based on its molecular geometry given below?

A gas mixture contains equal number of moles of He and Ne. The total pressure of the mixture is 3.0 atm. What are the partial pressures of He and Ne? (Given: Xa =nantotal{“version”:”1.1″,”math”:”Xa =nantotal”}; Pa = Xa.Ptotal )

The following molecule/ion is paramagnetic based on its molecular orbital (MO) diagram.

How does the root mean square velocity (rms) of H2 compared to that of O2 at same temperature? [Given: Urms, H2Urms, O2 = MO2MH2{“version”:”1.1″,”math”:”Urms, H2Urms, O2 = MO2MH2″}; Molar masses (g/mol): H2 (2.02), O2 (32.00)]

Choose the best Lewis structure for NH4+ . (Given the group numbers of elements: N (Group 5A), Hydrogen (Group 1A).

1.00 mol of steam (18.0 g) warms from 100 °C to 125 °C. The amount of heat required  to warm the steam is (Given: q = mCs, steam ΔT;   Cs, steam = 2.01 J/g.oC). 

The formal charge for H in the NH3 molecule is calculated as shown below. What is the formal charge on N? [Given: H (Group 1A) and N (Group 5A)]

Which is the most stable resonance structure of HCN?