Answer : Valence electrons in atom A = 1, B = 6 and C = 2.
Explanation :
Valence electrons means the outermost electrons are the ones which involved in bonding. Electrons are arranged in energy levels or shells.
Valence electrons are found in the highest energy orbitals of an element.
- The electronic configuration of (Na) is
. The highest energy orbital is 3s orbital which contains 1 electron. So,
The number of valence electrons in (Na) = A = 1
Similarly,
- The electronic configuration of (O) is
. The highest energy orbital are 2s and 2p orbitals which contains (2 + 4) = 6 electrons. So,
The number of valence electrons in (O) = B = 6
- The electronic configuration of (Fe) is
. The highest energy orbital is 4s orbital which contains 2 electrons. So,
The number of valence electrons in (Fe) = C = 2
Answer:
True
Explanation:
For a stationary fluid, the pressure will vary in the x, y and z directions.
Answer:
T°fussion of solution is -18°C
Explanation:
We have to involve two colligative properties to solve this. Let's imagine that the solute is non electrolytic, so i = 1
First of all, we apply boiling point elevation
ΔT = Kb . m . i
ΔT = Boiling T° of solution - Boiling T° of pure solvent
Kb = ebuliloscopic constant
105°C - 100° = 0.512 °C kg/mol . m . 1
5°C / 0.512 °C mol/kg = m
9.7 mol/kg = m
Now that we have the molality we can apply, the Freezing point depression.
ΔT = Kf . m . i
Kf = cryoscopic constant
0° - (T°fussion of solution) = 1.86 °C/m . 9.76 m . 1
- (1.86°C /m . 9.7 m) = T°fussion of solution
- 18°C = T°fussion of solution
Answer:
-245.7°C es la temperatura del gas bajo 100 torr
Explanation:
Para resolver esta pregunta debemos hacer uso de la ley de Boyle que establece que la presión de un gas es directamente proporcional a la temperatura de este cuando el volumen permanece constante. La ecuación es:
P1T2 = P2T1
<em>Donde P es presión y T temperatura absoluta del estado inicial, 1, y final, 2.</em>
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Reemplazando:
P1 = 1000torr
T2 = ? -Incógnita-
P2 = 100torr
T1 = 273K -Temperatura del hielo fundido = 0°C = 273K
1000torrT2 = 100torr273
T2 = 27.3K
27.3K - 273 =
<h3>-245.7°C es la temperatura del gas bajo 100 torr</h3>
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I don’t understand. Is there a picture? Where are the options?