QuestionQuestion

1. A mason jar with a constant volume is sterilized in a dishwasher that reaches 120 degrees C, and is immediately sealed at that temperature upon being removed. The jar then cools to room temperature (21 degrees C). If the initial pressure is 1.00 atm, what is the pressure inside the jar after the cooling process?

2. A hot air balloon has a volume of 600 m3 and is heated to around 90 degrees C. When the balloon takes off at sea level, the pressure is approximately 1.00 atm. How many moles are present in the balloon?

3. A piece of ice with a mass of 14.10g is placed in a calorimeter with an initial temperature of 21.2 degrees C. At the instant the ice finishes melting, the temperature of the calorimeter is 18.2 degrees C. If the heat capacity of the calorimeter is 1.567 kJ/degrees C, what is the enthalpy of the ice melting in kJ/mol?

4. From the given frequencies of light, calculate the wavelength and energy of a single photon.

Frequency: 1005 MHz

Frequency: 256 KHz

5. An incandescent light bulb emits light with a wavelength of 1.00. If the lightbulb emits 60.0 J/s, how many photons are emitted per second?

6. Complete and balance the following equations, making sure to indicate whether the products are solid, aqueous, or gaseous. If not reaction occurs, write “No Reaction.”
HCl (aq)+ Ba(OH)2(aq)
NaOH(aq)+ FeCl3(aq)

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1. A mason jar with a constant volume is sterilized in a dishwasher that reaches 120 degrees C, and is immediately sealed at that temperature upon being removed. The jar then cools to room temperature (21 degrees C). If the initial pressure is 1.00 atm, what is the pressure inside the jar after the cooling process?

At constant volume and composition,
P1/T1 = P2/T2
P1 = 1.00 atm
T1 = 120 C = 120 + 273.15 = 393.15 K
P2 = ?
T2 = 21 C = 21 + 273.15 = 294.15 K

(1.00 atm/393.15 K) = P2/294.15 K
P2 = 0.748 atm...

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