The amount of matter stays the same between the substances,
The given thermochemical reaction is between hydrogen gas and chlorine gas to form hydrogen chloride.
This can be represented as:
Δ
=-184.6 kJ/mol
So when two moles of HCl is formed, 184.6 kJ of energy is released.
Calculating the heat released when 3.18 mol HCl (g) is formed in the reaction:

Therefore, 293.5 kJ of heat is released when 3.18 mol HCl is formed in the reaction between hydrogen and chlorine.
Answer:
A. There is more dissolved oxygen in colder waters than in warm water.
D. If ocean temperature rise, then the risk to the fish population increases.
Explanation:
Conclusion that can be drawn from the two facts stated above:
*Dissolved oxygen is essential nutrient for fish survival in their aquatic habitat.
*Dissolved oxygen would decrease as the temperature of aquatic habit rises, and vice versa.
*Fishes, therefore, would thrive best in colder waters than warmer waters.
The following are scenarios that can be explained by the facts given and conclusions arrived:
A. There is more dissolved oxygen in colder waters than in warm water (solubility of gases decreases with increase in temperature)
D. If ocean temperature rise, then the risk to the fish population increases (fishes will thrive best in colder waters where dissolved oxygen is readily available).
a. 0.51 moles of Mg
b. 0.25 moles of F
Explanation:
a. To find the number of moles knowing the mass we use the following formula:
number of moles = mass / molecular weight
number of moles of Mg = 12.15 / 24 = 0.51 moles
b. To find the number of moles knowing the number of atoms we use Avogadro's number to illustrate the following reasoning:
if in 1 mole of F there are 6.022 × 10²³ atoms of F
then in X moles of F there are 1.5 × 10²³ atoms of F
X = (1 × 1.5 × 10²³) / 6.022 × 10²³
X = 0.25 moles of F
Learn more about:
Avogadro's number
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