Answer:

Explanation:
Consider that, as the system is adiabatic,
where U1 and U2 are the internal energies before the process and after that respectively.
Consider that:
, and that the internal energy of the first state is the sum of the internal energy of each tank.
So, 
Where A y B are the tanks. The enthalpy for an ideal gas is only function of the temperature, as the internal energy is too; so it is possible to assume: 
So, 
Isolating
,


So,

True, its called sublimation. (vice versa as well)
It says Methane+Oxygen forms Water+Carbon dioxide and everything is in gaseous state.
CH4+2O2->2H2O+CO2
Answer: 4 x 10 ∧-2 moles of nitrogen.
Explanation:
The chemical formular for quinine is ; C20 H24 N2 O2
As can be seen from the chemical formular;
1 mole of quinine contains 2 moles of Nitrogen
Thus; 2.0 x 10 ∧-2 moles of quinine would contain
2.0 x 10 ∧-2 x 2 = 4 x 10 ∧-2 moles of nitrogen.
Therefore 4 x 10 ∧-2 moles of nitrogen are in 2.0×10−2mole of quinine
A strong chemical bond is formed by sharing electrons.