URGENT HELP PLEASE (c) Measurement of waves at the beach one day shows that the velocity (speed) of the waves is 3 m/s and the distance between wave peaks is 20 m. What are the frequency and wave period for these waves? Show your working:

f waves at the beach one day shows that the velocity (speed) of the waves is 3 m/s and the distance between wave peaks is 20 m. What are the frequency and wavef waves at the beach one day shows that the velocity (speed) of the waves is 3 m/s and the distance between wave peaks is 20 m. What are the frequency and wave period ff waves at the beach one day shows that the velocity (speed) of the waves is 3 m/s and the distance between wave peaks is 20 m. What are the frequency and wave period ff waves at the beach one day shows that the velocity (speed) of the waves is 3 m/s and the distance between wave peaks is 20 m. What are the frequency and wave period f period f

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂