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3 years ago

Convert 23 calories into kcal

Chemistry

2 answers:

AVprozaik [17]3 years ago

6 0

0.023, to do it, just simply divide the energy value by 1000.

ValentinkaMS [17]3 years ago

3 0

0.023 is 23 calories converted to kcal

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½O2(g) + H2(g) ⇌ H2O(g)

ira [324]

Answer:

-241.826 kJ·mol⁻¹; -146.9 J·K⁻¹mol⁻¹; 664.6 J·K⁻¹mol⁻¹; spontaneous

Explanation:

½O₂(g) + H₂(g) ⟶ H₂O(g)

ΔHf°/kJ·mol⁻¹: 0 0 -241.826

S°/J·K⁻¹mol⁻¹: 205.0 130.6 188.7

1. ΔᵣH

ΔᵣH = products -reactants = -241.826 -(0 + 0) = -241.826 kJ·mol⁻¹

2. ΔᵣS

ΔᵣS = products - reactants = 188.7 - (205.0 + 130.6) = 188.7 - 335.6 = -146.9 J·K⁻¹mol⁻¹

3. ΔS(univ)

$\begin{array}{rcl}\Delta S_{\text{univ}} &=& \Delta S_{\text{sys}} +\Delta S_{\text{surr}}\\\\ &=& \Delta S_{\text{sys}} -\dfrac{\Delta H_{\text{sys}}}{T}\\\\& = & -146.9 - \dfrac{-241826}{298}\\\\& = & -146.9 + 811.5\\& = & \mathbf{664.6 \,\, J\cdot K^{-1}mol^{-1}}\\\end{array}$

4. Spontaneity

$\begin{array}{rcl}\Delta G &=& \Delta H - T\Delta S\\& = & -241.826 - 298 \times (-0.1469)\\& = & -241.826 + 43.776\\& = & \textbf{-198.050 kJ}\cdot\textbf{mol}^{\mathbf{-1}}\\\end{array}$

ΔG is negative, so the reaction is spontaneous.

4 0

3 years ago

What is the value for AG at 100 K if AH = 27 kJ/mol and AS = 0.09 kJ/mol.K)?

Aleonysh [2.5K]

The value for ΔG = 18 kJ/mol

<h3>Further explanation</h3>

Given

ΔH = 27 kJ/mol and ΔS = 0.09 kJ/mol.K

T = 100 K

Required

the value for ΔG

Solution

The spontaneous process of a reaction is based on 2 factors :

enthalpy change ΔH decreases and
entropy change ΔS increases

ΔG=ΔH-T.ΔS

$\tt \Delta G=27~kJ/mol-100\times 0.09~kJ/mol.K\\\\\Delta G=18~kJ/mol$

5 0

3 years ago

PLEASE HELP!!

yanalaym [24]

Answer:

Remove a H2 molecule from the left side of the equation.

Explanation:

i took the quiz and got it right

8 0

2 years ago

How many molecules are present in the following quantity<br> 0.250 mole of H2O

klio [65]

If 1mole ------------- is ---------------- 6.02*10²³
than 0.25mole ----- is ---------------- x

x = [0.25mole*6.02*10²³]/1mole = <u>1,505*10²³</u>

4 0

3 years ago

Answer plzzzz im begging

lisabon 2012 [21]

¿es demasiado tarde para ayudarte?

4 0

3 years ago

Convert 23 calories into kcal​

Convert 23 calories into kcal