Element X and Y are two different elements that are placed in the same group in the Periodic Table of Elements. Which of the fol
1 answer:
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Answer:
Explanation:
R = Rydberg constant =
= Principal quantum number of an energy level = 2
= Principal quantum number of an energy level for the atomic electron transition = 4
Wavelength is given by the Rydberg formula
The wavelength of the light emitted is .
Answer:
<em>2.54 mol CO2 </em>
Explanation:
To calculate the mol of carbon dioxide that will be generated by megajoule (MJ). First, we have to find the value of the formation enthalpy for the CO2 at standard conditions.
<em>Remember that standard conditions are at 25°C and 1 atm. </em>
Any physic chemistry book has the table of ΔHf°, I always use one name Levine's physic chemistry. You can trust its data.
Enthalpy of formation for CO2: -393.509 kJ/mol
As you can see this value means that for each 393.509 kJ liberate (that's indicated for the menus sing), 1 mol of CO2 is formed.
Let's write this using mathematic language:
393.509 kJ/ 1 mol CO2
The problem asks you to find how many mols are produced by 1 megajoule liberate, let's change megajoule to kilojoule.
1 megajoule (MJ) = 1000 kJ
1000 kJ x (1mol/ 393.509 kJ) = 2.54 mol CO2
<em>Remember don't use the negative value to make the calculus. The negative value just indicates that the heat is been released.</em>
If you want to watch the mathematics details, go to the image attached.
