The molecular geometry of the PF4+ ion is ________.

The amount of gas that occupies 60.82 L at 31.0 °C and 367 mm Hg is ________ mol. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

What is the wavelength of light (nm) that has a frequency 4.62 × 1014 s-1? YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

The electron-domain geometry of the AsF6- ion is octahedral. The hybrid orbitals used by the As atom for bonding are ________ orbitals

A solution containing 10.0 g of an unknown liquid and 90.0 g water has a freezing point of -3.33 °C. Given Kf= 1.86g/°C for water, the molar mass of the unknown liquid is ______g/mol. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be ________. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM 

The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is ________ M. The density of the solution is 0.79 g/mL. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

Which of the following correctly represents the third ionization of aluminum?

 When the following equation is balanced, the coefficients are ________.                                       Al(NO3)3 + Na2S → Al2S3 + NaNO3

 The temperature of a 15-g sample of lead metal increases from 22 °C to 37 °C upon the addition of 29.0 J of heat. The specific heat capacity of the lead is ________ J/g-K. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM