Q=mcΔt
669440 = 2.10³ x 4.184 x (100-20)
669440 = 669440 √ (correct)
MH₂: 2 g/mol
mNH₃: 17 g/mol
...............................
3H₂ + N₂ ---> 2NH₃
6g......................34g
6g H₂ ---- 34g NH₃
Xg -------- 13,09g
X = (6×13,09)/34
X = 2,31g H₂
100 degrees farenheight I think because thats when water boils in any matter
Explanation:
(a) According to Le Chatelier's principle, any disturbance caused in an equilibrium reaction will shift the eqilibrium in a direction that will oppose the change.
For example, 
So, in this reaction when we any of the reactants then it means there is less stress on reactant side. Hence, the reaction will move in the backward direction.
Whereas when we remove
then there will be decrease in concentration of products as the concentration of carbon dioxide has decreased. Hence, the reaction will shift on the product side, that is, reaction will shift in the forward direction.
Thus, we can conclude that out of the given options removing
as it is formed would force the reaction to favor the produc to favor the products.
(b) As the reaction equation is as follows.

Since, it is an exothermic reaction, that means when temperature is increasing then more amount of energy will release on the product side.
Hence, the reaction will shift on the reactant side, that is on the left hand side equilibrium will shift.
Answer:
Im pretty sure its alpha
Explanation:
Alpha radiation has been identified as helium nuclei that have been stripped of their planetary electrons, and each consists of two protons and two neutrons.