Quartz has the formula SiO2
From the periodic table:
mass of oxygen = 16 grams
mass of silicon = 28.0855 grams
Mass of one mole of quarts = 28.0855 + 2(16) = 60.0855 grams
number of moles = mass / molar mass
number of moles = 1.6 / 60.0855 = 0.0266 moles
Each mole of quartz contains Avogadro's number of atoms.
Therefore:
number of atoms in 1.6 g = 1.6 x 6.02 x 10^23 = 1.603 x 10^22 atoms
<span>The argument for biomass in place of fossil fuels centers in terms of GHG emissions has to do with the net balance of CO2. As Mr. Del Padre alludes to, the Carbon Cycle for biomass is considerably shorter in time than fossil fuels. While fossil fuels are a form of carbon sequestration, the time scale is on millions of years. The time to harvest energy crops is on the order of months to years, such that the CO2 removed from the atmosphere by plants while growing is equal to the CO2 upon combustion (or other processing.) However, biomass is also less energy dense, requiring more biomass than say coal to produce the same amount of steam to drive a turbine. E85 ethanol is roughly 30% less efficient than gasoline to drive a FlexFuel car, so there are trade-offs. Of course, the method of utilization (combustion, co-firing, pyrolysis, liquefaction) has a large impact on the net GHG emissions, and so it's difficult to suggest a blanket difference across both process and biomass type. There is a large literature on Life Cycle Analyses for a variety of biomass sources and energy production scenarios, which is a good place to start.
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K will always have an oxidation state of +1. Now O is -2 except in peroxides, this is not a peroxide, so total charge will be -6, if you subtract the +1 of K from it, it leaves -5 charge to be neutralized by Cl in KClO3, so Cl will be +5. In the product side, K will still have the same oxdiation which is +1 and Cl would have -1. O2 will have zero. <span>Now, Cl is gaining the electrons to go from +5 to -1, so it is getting reduced while O2 is losing electrons to go from -2 to zero so it is getting oxidized.</span>
The answer is 6396 years
Let's first calculate a number of half-lives using the equation:
<span>= decimal amount remaining, where n i number of half-lives
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After 15/16 of a given amount of radium-226 has been decayed, that means that the remaining amount is 1/16, which is in decimals 0.0625
So, now we can replace it:
tex] (1/2)^{n} = 0.0625 [/tex]
⇒ n * log(1/2) = log(0.0625)
n * log(0.5) = log(0.0625)
n = log(0.0625)/log(0.5)
n = 4
Now we know that number of half-lives is 4.
The number of half-lives is a quotient of total time elapsed and length of half-life.<span>
<span>So, total time elapsed is a product of a length of half-life (1599 years) and the number of half-lives (4). Since 1599 × 4 = 6396, then a scientist will have to wait 6396 years for decay of 15/16 of a given amount of radium-226.</span></span>
Answer : The the mechanism for the reaction is:
Step 1 : (Slow)
Step 2 : (fast)
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 overall reaction is:
The rate law expression is:
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.
Now we have to determine the mechanism for the reaction.
The mechanism for the reaction is:
Step 1 : (Slow)
Step 2 : (fast)