F---atomic number 9---1s2 2s2 2p5 -----7 electrons
Answer:
the change in energy of the gas mixture during the reaction is 227Kj
Explanation:
THIS IS THE COMPLETE QUESTION BELOW
Measurements show that the enthalpy of a mixture of gaseous reactants increases by 319kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that -92kJ of work is done on the mixture during the reaction. Calculate the change of energy of the gas mixture during the reaction in kJ.
From thermodynamics
ΔE= q + w
Where w= workdone on the system or by the system
q= heat added or remove
ΔE= change in the internal energy
q=+ 319kJ ( absorbed heat is + ve
w= -92kJ
If we substitute the given values,
ΔE= 319 + (-92)= 227 Kj
With the increase in enthalpy and there is absorbed heat, hence the reaction is an endothermic reaction.
Jet Stream are narrow bands of strong winds from the upper levels of the atmosphere and its location depends from year to year. It follows the boundaries hot and cold air so technically it takes the heat with it wherever it travels:from north to south.
1 mole of anything always contains 6.02x10^23 molecules or moles (this is Avogadro's number). you can use this ratio to find the number of atoms or molecules in any given amount of substance. Due to that 0.0012 moles can be multiplied by Avogadro's number to find that 0.0012 moles of anything contains 7.224x10^20 atoms or molecules depending on what type of substance you are looking at. Aluminum consists of atoms while octane consists of molecules.
I hope this helps. Let me know in the comments if anything is unclear.
Answer:
Explanation:
I usually just use approximate values for the elements on the periodic table. The reason for that is that everyone uses a different periodic table. Some are rounded others are more precise. Redo this problem with better numbers for the elements.
N = 14
H = 1
N2H4 = 2*14 + 4*1
N2H4 = 28 + 4 = 32
If you are given 31 grams of N2H4 then the formula is
mols = given mass / molecular mass
mols = 31 / 32
moles = 0.97
Now you have a problem . Is the answer 1.0 or is 0.9?
I think I would pick 1.0