Answer:
Na2SO4 means: two moles sodium (45.98 g), one mole sulfur (32.06 g), and four moles oxygen (64.00 g) combine to form one mole of sodium sulfate (142.04 g).
Explanation:
Economy - If there isn't a sustainable economy, it won't be able to support many people so instead they are limited.
Weather- If a place is too warm or too cold it can affect the population. The weather may be seen as harsh.
Government- If people are not agreeing with the government and are against, many will leave. They won't be able to withstand it.
Overpopulation- If there is too many people, they may restrict how many babies you can have and how many people can live there. China, a co
Answer:
The answer is 159.6882.
Assuming you are converting between grams Fe2O3 and mole.
Answer : The internal energy change is, -506.3 kJ/mol
Explanation :
Formula used :
or,
where,
= change in enthalpy = 
= change in internal energy = ?
= change in moles
Change in moles = Number of moles of product side - Number of moles of reactant side
According to the reaction:
Change in moles = 0 - 2 = -2 mole
That means, value of 
= 0
R = gas constant = 8.314 J/mol.K
T = temperature = 
Now put all the given values in the above formula, we get
Therefore, the internal energy change is -506.3 kJ/mol
A firework exploding is a chemical change as soon as you light the fuse the combustion reacts with the gunpowder.
I hope this helps, good luck!!!!
