Answer: The number of moles of 
reacted was 0.229
Explanation:
According to ideal gas equation:
P = pressure of gas = Total pressure - vapor pressure of water = (749 - 23.8) mm Hg= 725.2 mm Hg = 0.954 atm (760mmHg= 1atm)
V = Volume of gas = 5.87 L
n = number of moles = ?
R = gas constant =
T =temperature =
According to stoichiometry:
1 mole of 
is produced by = 1 mole of
Thus 0.229 moles of is produced by = 
moles of
Thus number of moles of reacted was 0.229
The answer is C.
Here’s a picture, if you need it.
Answer:
(C) is the mechanism that increases the temperature between the photosphere and corona of the sun.
Explanation:
When a stars is converted from hydrogen to helium then this is known as proton -proton chain reaction.Due to this reaction the temperature between corona of the sun and photosphere increases.The main reason for increasing the temperature is exothermic reaction.
So the option C is correct.
(C) is the mechanism that increases the temperature between the photosphere and corona of the sun.
FeS is an example of an ionic compound as in the formula there is a metal of Fe iron chemically bonded to the nonmetal S sulphur. Resulting in a strong electrostatic attraction due to the transfer of valence electrons from the iron to the Sulphur.
Acceleration is defined as velocity per unit time.
Here, a=acceleartion,
v=velocity=36 m/s
t=time=12 s
A car at rest ends accelerates for 12 seconds. After this time the car is going 36 m/s. So acceleration that is a=3 ms⁻².
