A) A balloon is inflated to a volume of 400 mL at a pressure of 1.62 atm and a t

Question

A) A balloon is inflated to a volume of 400 mL at a pressure of 1.62 atm and a temperature of 30 °C. How many moles of gas are in the balloon?

B)Describe the molecular geometry for NF3 (name the geometrical shape formed)

C)A bicycle tire is inflated to a pressure of 85 psi inside a warm garage at a temperature of 23 °C. What will the pressure of the tire be if the bike is taken outside on a cold winter day where the temperature is -30 °C?

D)Draw all resonance structures for NO3- & show calculation for valence electrons

-What are the resonance structures attempting to convey about the actual structure of the molecule? That is, why draw more than one Lewis structure for the same molecule?

Explanation / Answer

A)

Ideal gas equation: PV = nRT

P is pressure

V is volume

n is number of moles

R is constant (0.0821 atm L/mol K)

T is temperature

Given:

V = 400 mL = 0.400 L

P = 1.62 atm

T = 30 oC = (30 + 273) K = 303 K

n = PV/RT = (1.62 atm*0.400 L)/(0.0821 atm L/mol K * 303K) = 0.0260 mol

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