The change in heat is simply equal to:
change in heat ΔH = final enthalpy – initial enthalpy
ΔH = [280.25 g * 4.18J/gC * (17.5°C)] – [280 g * 4.18J/gC
* 13.5°C]
ΔH = 4,699.89 J = 4.7 kJ
<span>Hence heat released is about 4.7 kJ</span>
C. 0.1 M HCl
Explanation:
The solution with the lowest molarity is the most dilute of all.
This is why the choice is 0.1M of HCl.
Molarity is the same as concentration. The unit "M" denotes mole per liter volume of solution.
- Molarity is defined as the number of moles of solute in a give volume of solution.
- 0.1M means 0.1mole of HCl is dissolved in 1liter of solvent.
- The higher the number of moles dissolved and the more the concentration of the solution will be.
The order of increasing concentration is:
0.1M < 0.2M< 0.3M < 0.4M
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It mostly because they're so reactive and if they were in their pure form and touched water they would have a very violent reaction. They also want to be more stable so they look for more electrons and quickly bond.
On the other hand ammonia is a very dangerous chemical which has a pungent smell and effect the eyes of the user. Thus it kept always in the fume exhaust hood for storing and dispensing function.
The pH of ammonia buffer contains ammonium hydroxide (NH₄OH) and a salt of ammonia with a strong acid like (HCl) which produces, ammonium chloride (NH₄Cl) mixture. The evaporation rate of ammonia is so high at room temperature thus on opening of the buffer solution the ammonia get evaporated very fast and the concentration of ammonia decreases which affect the pH of the buffer solution.
Thus the reason to put ammonia buffer in fume hood is explained.
Answer:
SPECIFIC HEAT CAPACITY
Explanation:
Q = MC DELTA T
q = heat
c = specific heat
T = temperature ( final - initial )
