The appropriate answer is d. the high specific heat capacity of water. This unique quality of water makes it suitable as an organic solvent. Specific heat capacity is the energy required to change one gram of a substance by one degree. Organic processes need to be carried out at a specific temperature. The high specific heat capacity of water ensures that environmental changes in temperature.
There are 36 electrons in krypton.
Answer
is: pH value of solution is 11.85.<span>
[</span>OH⁻] = 7.1·10⁻³ M; equilibrium concentration of hydroxide anions.
[OH⁻]·[H⁺]
= Kw.
0.0071 mol/L · [H⁺] =
10⁻¹⁴ mol²/L².
[H⁺] = 10⁻¹⁴ mol²/L² ÷ 7.1·10⁻³ mol/L.
[H⁺] = 1.4·10⁻¹² mol/L.
pH
= -log[H⁺].
pH
= -log(1.4·10⁻¹² mol/L).
pH
= 11.85.
If
pH is less than seven, solution is acidic; greater than seven, solution is
basic; equal seven, solution is neutral.
Answer:
fH = - 3,255.7 kJ/mol
Explanation:
Because the bomb calorimeter is adiabatic (q =0), there'is no heat inside or outside it, so the heat flow from the combustion plus the heat flow of the system (bomb, water, and the contents) must be 0.
Qsystem + Qcombustion = 0
Qsystem = heat capacity*ΔT
10000*(25.000 - 20.826) + Qc = 0
Qcombustion = - 41,740 J = - 41.74 kJ
So, the enthaply of formation of benzene (fH) at 298.15 K (25.000 ºC) is the heat of the combustion, divided by the number of moles of it. The molar mass od benzene is: 6x12 g/mol of C + 6x1 g/mol of H = 78 g/mol, and:
n = mass/molar mass = 1/ 78
n = 0.01282 mol
fH = -41.74/0.01282
fH = - 3,255.7 kJ/mol