If a wave has a velocity of 150 meters per second and a wavelength of 800 cm what is the frequency of the wave in hertz

18.8 Hz

Explanation:

The formula relating the frequency (f) and wavelength (λ) is

fλ = v     Divide both sides by λ

f = v/λ

Data:

v = 150 m·s⁻¹

λ = 800 cm = 8.00 m

Calculation:

f = 150/8.00

f = 18.8 s⁻¹

f = 18.8 Hz

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

the pseudoscience are like beliefs, theories, or like practices that are considered scientific