Which of the following are properties of mechanical waves?

A mechanical wave can be described as a wave that moves by oscillations and transfers energy in a medium.

Some of the properties of the mechanical waves are:

1) The frequency of a wave equals the frequency of the vibrating source which is producing the wave.

2) Increasing the frequency of a wave decreases its wavelength.

3) The speed of a wave is equal to the wavelength multiplied by frequency.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g