The molar mass of stearic acid is 18*AC+36*AH+2*AO=18*12+36*1+16*2=284g/mol.
n=m/M=2.831/284=0.01 moles
C18H36O2+27O2-->18CO2+18H2O
we have 18*0.01=0.18 moles of CO2
18*0.01=0.18 moles of H2O
0.01*948=9.48kJ from stearic acid
0.18*393.5=70.83kJ from CO2
0.18*241.826=43.52kJ from H2O
9.48+70.83+43.52=123.83kJ
123.83*4.184=518.10kcal
Answer:
![\large \boxed{\text{392 u}}](https://tex.z-dn.net/?f=%5Clarge%20%5Cboxed%7B%5Ctext%7B392%20u%7D%7D)
Explanation:
1. Calculate the molal concentration
The formula for the freezing point depression by a nonelectrolyte is
![\Delta T_{f} = -K_{f}b\\b = -\dfrac{\Delta T_{f}}{ K_{f}} = -\dfrac{-0.465 \, ^{\circ}\text{C}}{\text{1.86 $\, ^{\circ}$C$\cdot$kg$\cdot$mol}^{-1}} = \text{0.250 mol/kg}](https://tex.z-dn.net/?f=%5CDelta%20T_%7Bf%7D%20%3D%20-K_%7Bf%7Db%5C%5Cb%20%3D%20-%5Cdfrac%7B%5CDelta%20T_%7Bf%7D%7D%7B%20K_%7Bf%7D%7D%20%3D%20-%5Cdfrac%7B-0.465%20%5C%2C%20%5E%7B%5Ccirc%7D%5Ctext%7BC%7D%7D%7B%5Ctext%7B1.86%20%24%5C%2C%20%5E%7B%5Ccirc%7D%24C%24%5Ccdot%24kg%24%5Ccdot%24mol%7D%5E%7B-1%7D%7D%20%3D%20%5Ctext%7B0.250%20mol%2Fkg%7D)
2. Calculate the moles of solute
![\begin{array}{rcl}b & = & \dfrac{\text{moles of solute}}{\text{kilograms of solvent}}\\\\\text{moles of solute} & = & b \times {\text{kilograms of solvent}}\\n & = &\text{0.250 mol/kg} \times \text{1.00 kg}\\ & = & \text{0.250 mol}\\\end{array}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Brcl%7Db%20%26%20%3D%20%26%20%5Cdfrac%7B%5Ctext%7Bmoles%20of%20solute%7D%7D%7B%5Ctext%7Bkilograms%20of%20solvent%7D%7D%5C%5C%5C%5C%5Ctext%7Bmoles%20of%20solute%7D%20%26%20%3D%20%26%20b%20%5Ctimes%20%7B%5Ctext%7Bkilograms%20of%20solvent%7D%7D%5C%5Cn%20%26%20%3D%20%26%5Ctext%7B0.250%20mol%2Fkg%7D%20%5Ctimes%20%5Ctext%7B1.00%20kg%7D%5C%5C%20%26%20%3D%20%26%20%5Ctext%7B0.250%20mol%7D%5C%5C%5Cend%7Barray%7D)
3. Calculate the molecular mass
Answer:
Yes
Explanation:
Because they support consumers. This is usually a green plant, because plants can make their own food by photosynthesis .
Hope this helps have an amazing day.........
Answer:
A & B: 8
C: O
D: 26
E: 30
F: Fe
Explanation:
the first one is Oxygen, the other is Iron.