An electron in a hydrogen atom travels from energy level n = 2 to energy level n = 4.   A. Would the electron be absorbing or emitting this energy in this transition B. What is the change in energy (ΔE) for this transition?

C2. Subject Chemistry

The reaction of A to produce B by the reaction 2A + C → B is exothermic with a ΔH = -345 kJ.  If 25.0 g of A (MW = 68.45 g/mol) are reacted, how many grams of ice (heat of fusion = 6.01 kJ/mol) could be melted with the released energy?

Your calibrated soup container has served you pretty well over the last several weeks, so you have decided to use it to heat up your soup for lunch using the microwave oven located just outside your lab. The oven warms food by delivering electromagnetic radiation with a frequency of 2.45 GHz at a rate of 7.39 x 10^26 photons per second. Your soup has a mass of 524 grams and your calibrated container has a heat capacity of 69.9 J °C-1. If the initial temperature of your soup is 25 °C, what will be its temperature if you allow it to heat in the microwave for 1.5 minutes? [Assume that the specific heat capacity of your soup is 4.18 J g-1 °C-1.]

A container with 0.2450.245 L of water is placed in a microwave and radiated with electromagnetic energy with a wavelength of 14.114.1 cm. The temperature of the water rose by 72.172.1 °C. Calculate the number of photons that were absorbed by the water. Assume water has a density of 1.00 g·mL−11.00 g·mL−1 and a specific heat of 4.184 J·g−1·°C−14.184 J·g−1·°C−1.

A) 425.66J/2.0360 g. Convert to kj/mol. Show the work. Molar mass = 39.99 NaOH B) 425.32J/ 1.9532g. Convert to kj/mol. Molar mass = 80.043 Na4NO3

Which expression correctly relates θ, d and λ? Explain using evidence from your observations.

Calculate the wavelength (in nanometers) of light with energy 1.32 x 10^-26 kJ per photon

? Which has higher energy, electromagnetic radiation with wavelength (A) 650 nm or with wavelength 234 nm? • X10 34 Jos (650nm) = 4.3069 x10-31 = 2 (6.6210x10-34 J·s) (3.0x10mis 4.3069 X10-31 hc he Which has lower energy, electromagnetic radiation with frequency (v) 90.3 MHz or with frequency 2.1 GHz?