Answer : The rate law for the following mechanism is
Explanation :
Rate law : It is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.
As we are given the mechanism for the reaction :
Step 1 : (fast)
Step 2 : (slow)
Overall reaction :
The rate law expression for overall reaction should be in terms of A and B.
As we know that the slow step is the rate determining step. So,
The slow step reaction is,
The expression of rate law for this reaction will be,
............(1)
Now applying steady state approximation for , we get:
...........(2)
Now substituting equation 2 in 1, we get:
Hence, the rate law for the following mechanism is
Answer:
l and t
Explanation:
because they are in group one
<u>Answer:</u> The wavelength of spectral line is 656 nm
<u>Explanation:</u>
To calculate the wavelength of light, we use Rydberg's Equation:
Where,
= Wavelength of radiation
= Rydberg's Constant =
= Final energy level = 2
= Initial energy level = 3
Putting the values in above equation, we get:
Converting this into nanometers, we use the conversion factor:
So,
Hence, the wavelength of spectral line is 656 nm
Covalent bond is when there is relatively less difference in electronegativity of constituent atoms. On the other hand, ionic bond is formed when there is large difference in electronegativity of constituent atoms.
In present case, electronegativity of F is 3.98, electronegativity of C is 2.55, electronegativity of tin is 1.96 and electronegativity of potassium is 0.82.
Here, since the electronegativity difference is minimum in case of C-F, so covalent bond will be preferentially with carbon.
It must also be noted that neon is an inert gas, hence it will not form bond with F.
The mass of MgO needed to produce 4.8 tonnes of Mg is
8 tonnes or 2,000 Kg or 2,000 ,000 g
calculation
Si + 2 MgO = SiO2 +2 Mg
step 1 :find the moles of Mg
moles = mass/molar mass
mass = 4.8 tonnes = 480,000 g
molar mass = 24 g/mol
moles is therefore = 480,000 g/24g/mol = 200,000 moles
then by use of mole ratio between MgO to Mg which is 1:1 therefore the moles of MgO is also = 200,000 moles
mass of MgO = moles of MgO x molar mass of MgO
molar mass of MgO = 24 + 16 =40 g/mol
therefore the mass = 200,000 moles x 40 g/mol = 8,000,000 grams or 8,000,000/1000= 8,000 Kg or 8,000/1000 = 8 tonnes