The Arrhenius equation relates activation energy to reaction rates and temperature:
ln (k2 / k1) = (E / R) * (1/T1 - 1/T2), where E is activation energy of 272 kJ, R is the ideal gas constant (we use the units of 0.0083145 kJ/mol-K for consistency, to cancel out the kJ unit), we let T1 = 718 K and k1 = 2.30 x 10^-5, and T2 = 753 K and k2 be the unknown.
ln (k2 / 2.30x10^-5) = (272 kJ / 0.0083145 kJ/mol-K) * (1/718 - 1/753)
k2 = 1.91 x 10^-4 /s
Answer: pH of HCl =5, HNO3 = 1,
NaOH = 9, KOH = 12
Explanation:
pH = -log [H+ ]
1. 1.0 x 10^-5 M HCl
pH = - log (1.0 x 10^-5)
= 5 - log 1 = 5
2. 0.1 M HNO3
pH = - log (1.0 x 10 ^ -1)
pH = 1 - log 1 = 1
3. 1.0 x 10^-5 NaOH
pOH = - log (1.0 x 10^-5)
pOH = 5 - log 1 = 5
pH + pOH = 14
Therefore , pH = 14 - 5 = 9
4. 0.01 M KOH
pOH = - log ( 1.0 x 10^ -2)
= 2 - log 1 = 2
pH + pOH = 14
Therefore, pH = 14 - 2 = 12
<span>the first major step for the dan replication to take place is the breaking of hydrogen bonds between bases of the two antiparallel strands </span>
Answer: "Calculate the enthalpy of formation of butane, C4H10, using the balanced chemical equation and tables displaying information about enthalpy of formation/combustion. Write out the solution according to Hess's law." That's all I'm given. The key says that the answer is -125.4 kJ. C4H10 + 6.5 O2 = 4CO2 + 5 H20 The heat of combustion for one mole of butane is -2877 K. Heats of formation from table C02 = -393.5 Kj/mole, H20 (g) -241.8 Kj/mole. Heat of combustion of butane = sum heats of formation products minus heats of formation reactants -2877 Kj = 4(-393.5Kj) + 5(-241.8Kj) minus heat or enthalpy of formation butane.
The enthalpy formation oxygen an element is assigned a value of zero.
-2877 Kj = -1582 Kj + -1209 Kj minus X
-2877 = - 2791 Kj minus X
X = -86 Kj. The heats of formation for various compounds vary a little from table to table, so this does not quite agree with your answer.
This is just an example
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Answer:</h2><h3>Force = m × a. Or, F = [M] × [L1 T-2] = M1 L1 T-2. This is also called the dimensional equation of force or the force dimension formula. Therefore, the Force is represented dimensionally as M1 L1 T-2.</h3>
