An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30°C. How many molecules are there in this gas? (R = 8.31 J/mol ? K,1.00 atm = 101 kPa, NA = 6.022 × 1023)
A) 2.4 × 1022 B) 6.1 × 1023 C) 2.3 × 1023 D) 6.0 × 1022
D
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A slab of material 1 rests on the surface of a slab of material 2 . A light ray in material 1 has an angle of incidence of 30° on the interface between the materials, while the ray in material 2 has an angle of refraction of 45°. What is the critical angle of incidence for total internal reflection for a ray of light going from material 2 to material 1?
a. 30° b. 45° c. In this case there is no critical angle. d. At least one of the indices of refraction or its equivalent is needed to solve this problem.
In about 14,000 AD, the North Pole of Earth will point at star ________.
A. Antares B. Vega C. Thuban D. Polaris
The energy used by a 100 watt light bulb in 1 hour is 100 kilowatt-hours
Indicate whether the statement is true or false
Thermodynamic Processes: The figure shows a pV diagram for 0.98 mol of ideal gas that undergoes the process 1 ? 2. The gas then undergoes an isochoric heating from point 2 until the pressure is restored to the value it had at point 1. What is the final temperature of the gas? (R = 8.31 J/mol ? K).
A. -160°C B. 12°C C. 380°C D. 110°C