1) What happened around 10,000 years ago that changed the way many humans live?
2 answers:
You might be interested in
<u>Answer:</u> The enthalpy change of the reaction is -243 J/mol
<u>Explanation:</u>
The heat released by the reaction is absorbed by the calorimeter and the solution.
The chemical equation used to calculate the heat released follows:
where,
c = heat capacity of calorimeter = 1620 J/K
= change in temperature =
(Change remains same)
Putting values in above equation, we get:
<u>Sign convention of heat:</u>
When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.
For the given chemical reaction:
We are given:
Moles of monoclinic sulfur = 1 mole
- To calculate the enthalpy change of the reaction, we use the equation:
where,
q = amount of heat released = -243 J
n = number of moles = 1 mole
= enthalpy change of the reaction
Putting values in above equation, we get:
Hence, the enthalpy change of the reaction is -243 J/mol
Answer:
The correct answer is option a.
Explanation:
When aluminum hydroxide reacts with of nitrous acid it gives of aluminum nitrite and of water.
According to above reaction ,when 1 mole of aluminum hydroxide reacts with 3 moles of nitrous acid it gives 1 mole of aluminum nitrite and 3 moles of water.
Hence, the correct answer is option a.