The ranges given are 4 × 10^14 to 7.5 × 10^14 Hz. At these frequencies, visible light type of waves are found in this region. This occurs at a wavelength of 400 - 700 nanometers and a color of violet through red. Outside this range, the naked eye cannot see the waves.
Answer: 
Explanation:
According to ideal gas equation:
P = pressure of gas = 0.987 atm
V = Volume of gas = 12 L
n = number of moles = 0.50
R = gas constant =
T =temperature = ?
Thus the temperature of a 0.50 mol sample of a gas at 0.987 atm and a volume of 12 L is
Answer:
0.00688 moles
Explanation:
The molarity ratio looks like this:
Molarity = moles / volume (L)
After you convert mL to L, you can plug the values into the equation and simplify to find moles.
27.5 mL / 1,000 = 0.0275 L
Molarity = moles / volume <----- Molarity ratio
0.250 M = moles / 0.0275 L <----- Insert values
0.00688 = moles <----- Multiply both sides by 0.0275
