Answer:
Approximately 
.
Explanation:
The actual yield of 
was given. The theoretical yield needs to be calculated from the quantity of the reactant.
Balance the equation for the hydrolysis of water:
.
Note the ratio between the coefficient of 
and 
:
.
This ratio will be useful for finding the theoretical yield of .
Look up the relative atomic mass of hydrogen and oxygen on a modern periodic table.
Calculate the formula mass of 
and :
.
.
Calculate the number of moles of molecules in 
of :
.
Make use of the ratio to find the theoretical yield of (in terms of number of moles of molecules.)
.
Calculate the mass of that approximately 
of (theoretical yield.)
.
That would correspond to the theoretical yield of (in term of the mass of the product.)
Given that the actual yield is 
, calculate the percentage yield:
.
Answer:
After 1326s, the concentration of pyruvic acid fall to 1/64 of its initial concentration.
Explanation:
The first order kinetics reaction is:
ln [A] = ln [A]₀ - kt
<em>Where [A] is concentration after t time, [A]₀ is intial concentration and k is reaction constant.</em>
To convert half-life to k you must use:
t(1/2) = ln 2 / K
221s = ln 2 / K
K = ln 2 / 221s
<h3>K = 3.1364x10⁻³s⁻¹</h3>
If [A] = 1/64, [A]₀ = 1:
ln [A] = ln [A]₀ - kt
ln (1/64) = ln 1 - 3.1364x10⁻³t
4.1588 = 3.1364x10⁻³s⁻¹t
1326s = t
<h3>After 1326s, the concentration of pyruvic acid fall to 1/64 of its initial concentration.</h3>
<em />
[A]0= Initial concentration
t1/2= half life
[A]= final concentration
k= rate constant
The answer is "<span>An atomic nucleus is positively charged because it is composed of protons". An atomic nucleus actually contains nucleons which are made up of both protons and neutrons. Since neutrons are neutral or have no charge, the charge of an atomic nucleus mainly relies on the positive charge of the protons.</span>
:
.
:
.