Q=mcΔT
q=(125g)(0.446 J/(g x °C))(78°C - 23.5°C)
q=(125 g)(0.446 J/(g x °C))(54.5°C) (Be sure to cancel all similar units)
q= 3038.375 J
53 becaus it dosent know how to do it
Answer:
47.25 moles
Explanation:
First we find the amount of O2 in mass in air
That will be = (21/100) x 3.6
This will give us=0.756 kg
Now we want to find the moles, so we convert this mass into grams since we are going to be working with grams= 0.756 x 1000 = 756 grams
Now, to find the number of moles:
moles= mass / molar mass
in this case mass is 756 grams and molar mass of oxygen is 16
So, the mass divided by molar mass would be =756/16= 47.25 moles of O2
B. It determines how difficult it is to start the reaction.
Explanation:
The activation energy is the energy barrier that must be surpassed before a chemical reaction proceeds.
In essence, it determines the ease and difficulty of starting a chemical reaction.
- Reacting species must posses a certain amount of energy so as to overcome the reaction barrier.
- The activation energy causes a reaction to occur.
- It is the energy acquired by reacting species in order to achieve effective collision.
Learn more:
Activation energy brainly.com/question/3930233
#learnwithBrainly
minutes. hope this helps.