Question

1. Consider a radio wave with a frequency of 95 x 106 s1. What is the wavelength, in meters of this wave? Your answer should have 2 significant figures.

2. What is the molarity of a solution that results from dissolving 0.44 mol of KBr in 1.12 liters

Answer 1

a) 3.16 m

b) 0.39 M

Step-by-step explanation:

a)

The wavelength of a radio wave with a frequency of 95 x 10^6 Hz can be calculated using the formula:

wavelength = speed of light / frequency

The speed of light is approximately 3 x 10^8 m/s. Substituting the given values:

wavelength = (3 x 10^8 m/s) / (95 x 10^6 Hz)

wavelength ≈ 3.16 m (rounded to 2 significant figures)

Therefore, the wavelength of the radio wave is approximately 3.16 meters.

b)

The molarity (M) of a solution can be calculated using the formula:

Molarity = moles of solute / liters of solution

Substituting the given values:

Molarity = 0.44 mol / 1.12 L

Molarity ≈ 0.39 M (rounded to 2 significant figures)

Therefore, the molarity of the solution is approximately 0.39 M.