It's C, the amount of protons in the nucleus of each atom :)
Answer: It will take for the concentration of A to decrease from 0.900 M to 0.210 M is 28.75 s
Explanation:
Zero order reaction : A reaction is said to be of zero order if the rate is independent of the concentration of the reactants, that means the rate is directly proportional to the zeroth power of the concentration of the reactants.
Expression for the zero order kinetics:
![[A]=-kt+[A]_o](https://tex.z-dn.net/?f=%5BA%5D%3D-kt%2B%5BA%5D_o)
where [A] = concentration left after time t = 0.210 M
= initial concentration = 0.900 M
k= rate constant =![0.0240Ms^{-1}](https://tex.z-dn.net/?f=0.0240Ms%5E%7B-1%7D)
t = time for reaction = ?
![0.210=-0.0240\times t+0.900](https://tex.z-dn.net/?f=0.210%3D-0.0240%5Ctimes%20t%2B0.900)
![t=28.75s](https://tex.z-dn.net/?f=t%3D28.75s)
Thus it will take for the concentration of A to decrease from 0.900 M to 0.210 M is 28.75 s
Answer:
20.2 kJ
Explanation:
Based on the information in the reaction, the amount of heat released per mole of Na₂O₂ (the molar enthalpy) is calculated as follows:
126 kJ / 2 mol = 63 kJ/mol Na₂O₂
The number of moles in 25.0g of Na₂O₂ must be calculated using the molecular weight of Na₂O₂ (77.978 g/mol):
(25.0 g)/(77.978 g/mol) = 0.32060 mol Na₂O₂
Thus, the heat released will be:
(63 kJ/mol)(0.32060 mol) = 20.2 kJ
What do you mean by this?
These are just a couple ways to identify unknown minerals,touch taste smell