Answer:
36365.4 Joules
Explanation:
The quantity of Heat Energy (Q) released on cooling a heated substance depends on its Mass (M), specific heat capacity (C), and change in temperature (Φ)
Thus, Q = MCΦ
Since, M = 45.4 g
C = 3.56 J/g°C,
Φ = 250°C - 25°C = 225°C
Q = 45.4g x 3.56J/g°C x 225°C
Q= 36365.4 Joules
Thus, 36365.4 Joules of heat energy is released when the lithium is cooled.
The limiting reagent : NH₃
<h3>Further explanation</h3>
A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients, and small or exhausted reactants become a limiting reactant
Reaction
4NH₃(g)+5O₂(g)⇒4NO(g)+6H₂O(g)
mol NH₃ :
mol O₂ :
mol ratio
NH₃ :
O₂ :
Limiting reactants : NH₃ (smaller ratio)
The density is the mass of a substance per unit volume. The surface water density is higher at the poles, and lower at the equator. Thus, the statement is false.
<h3>What is the relation between density and latitude?</h3>
The latitude is the distance from the poles. As moving down from the equator, the temperature increases. The increase in temperature at the equator allows larger mass to accumulate in a unit volume of water.
The larger mass-to-volume ratio results in the increased density of the water.
Thus, the ocean water has a higher density at the equator than poles, due to temperature differences. Therefore, the given statement is false.
Learn more about surface water density, here:
brainly.com/question/2968053
For combustion reaction we need oxygen and the results most of the time produce heat which mean first one is correct.
Answer:
(A) CHCH
Explanation:
Hello,
Alkynes are formed when triple bonds are formed between carbons, it means that due to the triple bonds, three bonds are already exhausted and carbon atoms need four bonds to attain the octet, for that reason, an extra bond is allowed. Now, such extra bond, when talking about hydrocarbons is filled with hydrogens, for that reason the alkyne should be (A) CHCH as it also accomplishes the following formula which is not accomplished by the rest of the options:
Since n=2, we have:
Which matches with CHCH.
Best regards.
