The first thing you need to know about this problem is that delta total = delta Hf products - delta Hf reactants.
Delta total = (4*NO + 6*H2O) - (5*O2 + 4*NH3)
Delta total = [(4*91.3 kJ/mol) + (6*-241.8 kJ/mol.) - (5*0 kJ/mol.) + (4*-45.9 kJ/mol.)
Products= 4*(365.2)+(-1450.8)=-1085.6 kJ
Reactants=4*(-45.9) + 5*(0)= -183.6 kJ
Delta Rxn= (-1085.6 kJ) - (-183.6 kJ) =-902.0 kJ
Answer:
C. 0.04 moles per cubic decimeter.
Explanation:
The molar mass of the Iodine is 253.809 grams per mole and a cubic decimeter equals 1000 cubic centimeters. The concentration of Iodine (
), measured in moles per cubic decimeter, can be determined by the following formula:
(1)
Where:
- Mass of iodine, measured in grams.
- Molar mass of iodine, measured in grams per mol.
- Volume of solution, measured in cubic decimeters.
If we know that
,
and
, then the concentration of iodine in a solution is:
![c = \frac{2.54\,g}{\left(253.809\,\frac{g}{mol} \right)\cdot (0.25\,dm^{3})}](https://tex.z-dn.net/?f=c%20%3D%20%5Cfrac%7B2.54%5C%2Cg%7D%7B%5Cleft%28253.809%5C%2C%5Cfrac%7Bg%7D%7Bmol%7D%20%5Cright%29%5Ccdot%20%280.25%5C%2Cdm%5E%7B3%7D%29%7D)
![c = 0.04\,\frac{mol}{dm^{3}}](https://tex.z-dn.net/?f=c%20%3D%200.04%5C%2C%5Cfrac%7Bmol%7D%7Bdm%5E%7B3%7D%7D)
Hence, the correct answer is C.
Answer:
c
Explanation:
it is c but im not exactly sure
you have a 25% chance tho
sorry
Answer:
it takes about 29.5 days for the moon to complete a cycle