Answer:
a. 0.933 M⁻¹.cm⁻¹
b. 0.003 M/s
Explanation:
a. The molar absorptivity coefficient (ε) is the ability of 1 mol of the substance to mitigate the light of a wavelength. It means that it's a measure of how strong a substance can absorb radiation. It can be calculated by the absorbance (A), the concentration (c) and the length of the cuvette (l).
ε = A/(c*l)
Thus, at t = 0, for the blue reactant, A = 0.77, c = 0.75 M, l = 1.10 cm.
ε = 0.77/(0.75*1.10)
ε = 0.933 M⁻¹.cm⁻¹
b) The rate of the reaction can be found by the rate of desapering of the blue reactant. Let's find the concnetration when t = 30.00 s:
ε = A/(c*l)
0.933 = 0.67/(c*1.10)
1.10c = 0.67/0.933
1.10c = 0.7181
c = 0.65 M
Thus, the rate is the variation of the concentration divided by the time variation:
r = (0.75 - 0.65)/30
r = 0.003 M/s
Because the coefficient of the blue reactant is 1, the rate of reaction is equal to the rate of disappearing of B, 0.003 M/s.
The concentration in weight percent when 6 g of sugar is mixed with 9 g of water is 40%.
There are several ways to denote the concentration of a solution like
- Molarity
- Molality
- Mass percent
- Mole Fraction
The formula for calculating mass percent is as follows
Mass per cent = (Mass of solute/Mass of solute + Mass of solvent) x 100%
In the given situation sugar is the solute and water is the solvent.
Putting the given values in the above formula
Mass per cent = (6/6+9) x 100%= 6/15 x 100% = 40%
Hence, the concentration in weight percent when 6 g of sugar is mixed with 9 g of water is 40%.
To know more about "concentration of a solution", refer to the link given below:
brainly.com/question/26579666?referrer=searchResults
#SPJ4
Answer:
Hope this helps you!
Explanation:
Include big outside heaters and inside heaters to maintain warm
Also wear special clothes to keep body warmth
Group 17. the 2nd column from the right in the periodic table.
Answer:
A is the answer i am pretty sure