Answer:
b. the heating of 10 g of liquid water from 0°C to 100°C.
Explanation:
Hello,
In this case, we must notice a., c. and d. processes are not actually absorbing heat but releasing it since cooling, freezing and condensation are processes with negative heat sign since matter changes from a state of more energy to a state of less energy. We can prove this by realizing that freezing enthalpy of water is -6.00 kJ/mol, condensation enthalpy of eater is -40.8 kJ/mol and a change of temperature from 100 °C to 0 °C is negative.
In such a way, the only process absorbing heat is b. the heating of 10 g of liquid water from 0°C to 100°C since energy must be added to the system, or absorbed by it in order to attain the heating.
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Answer:
25.05 g of S₈
Explanation:
The balance chemical equation for given synthetic reaction is,
S₈ + 8 O₂ → 8 SO₂
Step 1: <u>Calculate Moles of SO₂ at STP:</u>
According to Avogadro's Law, at STP (0 ° C and 1 atm) every ideal gas occupies 22.4 L of volume. Therefore, the moles contained by 17.5 L of SO₂ are as;
Moles = 17.5 L / 22.4 L
Moles = 0.781 moles of SO₂
Step 2: <u>Calculate Moles of S₈ consumed:</u>
According to balance equation,
8 moles of SO₂ were produced by = 1 mole of S₈
So,
0.781 moles of SO₂ will be produced by = X moles of S₈
Solving for X,
X = 0.781 mol × 1 mol / 8 mol
X = 0.0976 moles of S₈
Step 3: <u>Calculate Mass of S₈ as;</u>
Mass = Moles × M.Mass
Mass = 0.0976 mol × 256.52 g/mol
Mass = 25.05 g of S₈
Every element can exist in the solid, liquid, or gas state, depending on
its temperature and the pressure around it.
Complete question:
Assume that five weak acids, identified only by numbers (1, 2, 3, 4, and 5) have the following ionization constants: A1 - Ka = 1.0 x 10-3 A2 - Ka = 3.0 x 10-5 A3 - Ka = 2.6 x 10-7 A4 - Ka = 4.0 x 10-9 A5 - Ka = 7.3 x 10-11
The anion of which acid is the strongest base? a) A2 b) A5 c) A3 d) A1 e) A4
Answer:
(B) The anion with the strongest base is A5
Explanation:
Acidity of a solution depends on the concentration of H⁺
Assuming a constant solution molarity (HA), then
pH = -Log{H⁺]
For A1: , pH = 1.5
For A2: , pH = 2
For A3: pH = 3
For A4: pH = 4
For A5: pH = 5
From the calculation above, the strongest acid is A1 and the weakest Acid is A5.
Therefore, the anion with the strongest base is A5
Answer:
Explanation:
Writing the equation properly:
(CH₃)₃N + H₂O ⇄ (CH₃)₃NH⁺ + OH⁻
HNO₃ + H₂O ⇄ H₂O + NO₃⁻
The bronsted-lowry theory defines an acid as a proton donor and a base as a proton acceptor.
In a bronsted-lowry acid-base reaction, the original acid gives up its proton and becomes a conjugate base. Also, the original base accepts a proton and becomes a conjugate acid. For every acid, there is a conjugate base and for every base there is a conjugate acid.
What differentiates an acid from its conjugate base is a proton. The difference between a base and its conjugate acid is a proton.
(CH₃)₃N + H₂O ⇄ (CH₃)₃NH⁺ + OH⁻
Bronsted-lowry base acid conjugate acid conjugate base
HNO₃ + H₂O ⇄ H₃O⁺ + NO₃⁻
Bronsted-lowry acid base conjugate acid conjugate base