the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.
Answer:
![t=9.7s](https://tex.z-dn.net/?f=t%3D9.7s)
Explanation:
Hello,
In this case, we have a second order kinetics given the second power of the concentration of chlorine (V) oxide in the rate expression, thus, the integrated equation for the concentration decay is:
![\frac{1}{[Cl_2O_5]}=kt+\frac{1}{[Cl_2O_5]_0}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%5BCl_2O_5%5D%7D%3Dkt%2B%5Cfrac%7B1%7D%7B%5BCl_2O_5%5D_0%7D)
Thus, the final concentration for a 94% decrease is:
![[Cl_2O_5]=0.600M-0.600M*0.94=0.036M](https://tex.z-dn.net/?f=%5BCl_2O_5%5D%3D0.600M-0.600M%2A0.94%3D0.036M)
Therefore, we compute the time for such decrease:
![kt=\frac{1}{[Cl_2O_5]}-\frac{1}{[Cl_2O_5]_0}=\frac{1}{0.036M}-\frac{1}{0.60M} =26.1M^{-1}](https://tex.z-dn.net/?f=kt%3D%5Cfrac%7B1%7D%7B%5BCl_2O_5%5D%7D-%5Cfrac%7B1%7D%7B%5BCl_2O_5%5D_0%7D%3D%5Cfrac%7B1%7D%7B0.036M%7D-%5Cfrac%7B1%7D%7B0.60M%7D%20%3D26.1M%5E%7B-1%7D)
![t=\frac{26.1M^{-1}}{k}= \frac{26.1M^{-1}}{2.7M^{-1}*s^{-1}}\\\\t=9.7s](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B26.1M%5E%7B-1%7D%7D%7Bk%7D%3D%20%5Cfrac%7B26.1M%5E%7B-1%7D%7D%7B2.7M%5E%7B-1%7D%2As%5E%7B-1%7D%7D%5C%5C%5C%5Ct%3D9.7s)
Regards.
A chemical reaction absorbs energy which means it is endothermic reaction.
The reaction is endothermic if the energy of products is more than the energy of reactants.
The energy of products is more means that the bond energy of products is more than the bond energy of reactants.
so breaking of bond needs energy which is greater than the energy released in making of new bonds.
Enthalpy of reaction = Bond energy of reactants - Bond energy of products.
Answer:
the number of moles is 0.279
Explanation:
The computation of the number of moles of calcium nitrate, is shown below;
We know that
Number of moles = mass of substance ÷ molecular weight
= 45.8 g ÷ 164.088
= 0.279moles
hence, the number of moles is 0.279
We simply applied the above formula so that the correct value could come
Answer:
.46 moles
Explanation:
PV = n RT make sure you use the correct R = 8.31446 L-kPa/(K-mol)
36 * 38 = n * 8.31446 * (273.15 + 82)
n = .463 moles