Physical Chemistry Answers

You wish to grow a thin film of anthracene using thermal evaporation. If your thermal evaporation chamber can reach pressures as low as 10.0 mPa, to what temperature do you need to heat anthracene to cause it to sublime?

What is the balanced chemical equation of the reaction between solid white phoshorus and oxygen produces solid tetraphosphorusdecoxide?

At T= 100 K, 1.00 mol of CO₂ occupies a volume of 1.00 L. Calculate the pressures given by the ideal gas equation and the van der Waals equation. (a= 3.610 atm dm⁶ mol^-2) and (b = 4.29 dm³ mol^-1).

1.    How many liters of 4.3 M Li₂O solution are required to make 5L of 2.1 M Li₂O?

Which of the following statements are INCORRECT?

(1) A carbon-hydrogen bond in methane, CH3, is nonpolar

(2) Electronegativity is the property of the atoms forming a given bond which

determines the polarity of the bond.

(3) Covalent bonds can only be polar.

(4) The electronegativity of elements on the periodic table increases going to the right

in each row.

A flexible container at an initial volume of 5.120 L contains 8.500 mol of helium. More

helium is then added to the container until it reaches a final volume of 18.10 L. Assuming

the pressure and temperature of the gas remain constant, calculate the number of moles of

helium added to the container. Calculate the mass of helium added.

1. What is the percentage composition of water in magnesium sulphate heptahydrate?.
2. Draw the Lewis Dot Structures of the following molecules and state the total number of their valence electrons.

a. xenon tetrafluoride (XeF4)

b. sulphur pentachloride (SF5)

c. phosphurus hexafluoride

According to the IR absoprtion spectrum of carbon monoxide, CO, the vibrational frequency is 2170 cm^-1. If we consider that the CO molecule behaves as a harmonic oscillator, predict the vibrational frequency if the molecule contains the isotope ¹³C instead of the more abundant ¹²C? 

v^:13CO/ v^:12CO = (μ^:13CO/μ^:12CO)^1/2

where v = vibrational frequency

μ = reduced mass.   

m ¹²C = 12.0 and m ¹³C = 13.0, m ¹⁶O = 16.0.

is it possible for a reaction to occur if the reaction results in a decrease in the entropy of the chemicals involved in the reaction

Calculate the Gibbs energy, entropy, and enthalpy of mixing when 2.00 mol C6H14

(hexane) is mixed with 3.00 mol C7H16 (heptane) at 298 K; treat the solution as ideal