Answer:
hello your question is incomplete the options are missing
Determine the resultant velocity for the plane when it is travelling
i) To the east
ii) To the west
answer :i) 270 i
ii) -150 i
Explanation:
velocity of Airplane = 210 m/s
wind velocity = 60 m/s to the east
The resultant velocity for the plane when it is travelling
let the velocity of the wind = V2
velocity of the plane = v1
i) The resultant velocity for the plane when travelling to the east
Vr = V2 i + V1 i
Vr= 60i + 210i = 270i
ii) resultant velocity when the plane is travelling to the west
Vr = - V1 i + V2i
= -210i + 60 i = -150 i
Infrared (IR) spectroscopy uses infrared radiation to excite the molecules of a compound and generates an infrared spectrum of the energy absorbed by a molecule as a function of the frequency or wavelength of light
One mole of any element is Avogadro's number, which is 6.02 * 10^23 atoms.
One mole of Calcium is equal to its atomic weight in grams, 1 mole Ca = 40.08 x 1000 mg = 6.02 * 10^23 atoms.
We have 8.6mg of Ca which means 8.6mg / 40,080mg = .00021457 of a mole of calcium.
Now multiply that by Avogadro's number which gives number of atoms = 0.00021457 * 6.02 * 10^23 atoms. So the answer is 1.292 * 10^20 atoms of Ca.
Answer is: molar heat of reaction of combustion of ethanol is 1237.435 kJ/mol.
m(C₂H₅OH) = 35.6 g.
n(C₂H₅OH) = m(C₂H₅OH) ÷ M(C₂H₅OH).
n(C₂H₅OH) = 35.6 g ÷ 46.07 g/mol.
n(C₂H₅OH) = 0.772 mol.
ΔT = 76.0°C - 35.0°C = 41°C.
Q = ΔT · C.
Q = 41°C · 23.3 kJ/°C.
Q = 955.3 kJ.
ΔH = Q / n(C₂H₅OH).
ΔH = 955.3 kJ / 0.772 mol.
ΔH = 1237.435 kJ/mol.
