This is an incomplete question, here is a complete question.
The reaction below has a Kp value of 3.3 × 10⁻⁵. What is the value of Kc for this reaction at 700 K?
Answer : The value of is,
Explanation :
The relation between and is:
where,
= equilibrium constant at constant pressure =
R = gas constant = 0.0821 L.atm/mol.K
T = temperature = 700 K
= change in number of gaseous moles = Product moles - Reactant moles = (2+1) - (2) = 3 - 1 = 1 mol
= equilibrium constant
Now put all the given values in the above expression, we get:
Therefore, the value of is,
Acting on the same object
Answer:
The correct answer is - A. 12.5 gram.
Explanation:
Given:
The initial amount of sample = 400 gram
the half-life cycle = 3 days
after 15 days remain value = ?
Solution:
The number of half-lives in 15 days = 15/3
= 5 half-lives
the remaining amount of sample after one half-life 3 days = 400/2 = 200
the remaining amount of sample after 2nd half-life or 6 days= 200/2 = 100
the remaining amount of sample after 3rd half-life or 9 days= 100/2 = 50
the remaining amount of sample after 4th half-life or 12 days= 50/2 = 25
the remaining amount of sample after 5th half-life or 15 days= 25/2 = 12.5 gram
Thus, the correct answer is = 12.5 g.
The uneven heating rates are due to a few factors. One such factor is the fact that since the earth is a spherical shape, it is impossible to heat evenly. Another is the fact that land and water heat and cool at different rates.
Answer:
The burning of wood is a chemical change.
Explanation:
A chemical change (chemical reaction) is a change of materials into other, new materials with different properties, and one or more new substances are formed. Burning of wood is a chemical change as new substances which cannot be changed back (e.g. carbon dioxide) are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash.
While, Physical change is opposite of a chemical change is a physical change. Physical changes are a change in which no new substances are formed, and the substance which is changed is the same. For instance, if a stick of wood is broken, there is still a stick of wood; it is just broken.
Conclusion:
Burning Wood is an example of a chemical change that is not reversible.