Quantum Physics: Photons and Energy Calculations

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How many photons are contained in a flash of green light (525 nm) that contains 189 kJ of energy?

4.99 × 10^23 photons
2.01 × 10^24 photons (correct)
5.67 × 10^23 photons
1.25 × 10^31 photons

What is the energy of the red light emitted by a neon atom with a wavelength of 703.2 nm?

2.83 × 10^-19 J
2.34 × 10^-19 J
4.27 × 10^-19 J (correct)
6.45 × 10^-19 J

For n = 3, what are the possible l sublevels?

0, 1
0, 1, 2 (correct)
0
0, 1, 2, 3

Which transition emits the highest energy photons?

n=4 to n=1 (C) Signup and view all the answers

What value of l is represented by a f orbital?

3 (C) Signup and view all the answers

What volume of gas will a balloon contain at 1.35 atm and 253 K if it is initially 25.0 L at 353 K and 2575 mm Hg?

58.6 L (D) Signup and view all the answers

What pressure will 14.0 g of CO exert in a 3.5 L container at 75°C?

6.4 atm (A) Signup and view all the answers

At standard temperature and pressure (STP), what is the temperature in Kelvin?

273 K (D) Signup and view all the answers

If a gas cylinder with constant volume is cooled, what observation can be made?

Decreased kinetic energy (C) Signup and view all the answers

What is the determined density of CO2 gas at STP?

2.24 g/L (D) Signup and view all the answers

How many grams of XeF6 are needed to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C?

35.2 g (A) Signup and view all the answers

What is the molar mass of an unknown compound if a 0.465 g sample occupies 245 mL at 298 K and 1.22 atm?

38.0 g/mol (B) Signup and view all the answers

Which gas particle travels the fastest among Ne, H2, Cl2, CO, and N2?

H2 (A) Signup and view all the answers

What is the final temperature of a gold nugget that has a mass of 376 g, starts at 398 K, and loses 4.85 kJ of heat to a snowbank?

297 K (D) Signup and view all the answers

What is the change in internal energy (ΔE) for a system losing 25.0 kJ of heat while changing volume from 12.00 L to 6.00 L at 1.50 atm?

-25.9 kJ (A) Signup and view all the answers

Calculate the standard reaction enthalpy (ΔH°rxn) for the reaction of P4(g) and Cl2(g) forming PCl5(s).

-1786 kJ (D) Signup and view all the answers

What term describes the vertical height of a wave from node to crest?

Amplitude (C) Signup and view all the answers

Which reaction correctly illustrates the formation enthalpy (H°f) for CsHCO3?

Cs+(aq) + HCO3−(aq) ⟶ CsHCO3(s) (A) Signup and view all the answers

Using the provided H°f values, calculate H°rxn for the following reaction: SO2Cl2(g) + 2 H2O(l) ⟶ 2 HCl(g) + H2SO4(l).

-422 kJ (C) Signup and view all the answers

Which visible color of light has the highest frequency?

Blue (C) Signup and view all the answers

What is the wavelength of blue light emitted by a mercury lamp with a frequency of 6.88 × 10^14 Hz?

450 nm (C) Signup and view all the answers

Volume of gas at different conditions

Calculating the volume of a gas when temperature and pressure change.

Gas pressure calculation

Determining the pressure exerted by a gas given its mass, volume, and temperature.

Standard Temperature and Pressure (STP)

Standard conditions for measuring gas properties; 273 K and 1 atm pressure

Effect of cooling gas cylinder

Cooling a gas cylinder with constant volume and moles results in decreased kinetic energy, fewer molecular collisions, and lower pressure.