Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc? Ca → ZnCO3
2 answers:
The right choice is,
Explanation:
A displacement reaction: occurs when a more reactive element replaces a less reactive one in its compound easily.
In this context, A is the more reactive element while B is less reactive.
The balanced chemical reaction presented will be,[ [TAG_21]]
In this case, calcium easily displaces zinc since it is a more reactive element than zinc.
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The balanced chemical equation for the neutralization of HCl with is:
Given weight of = 5g
Moles of =
Volume of HCl solution =
Assuming the density of the solution is 1.0 g/mL
Mass of HCl solution = 50 g
Overall mass of the solution = 50 g + 5 g = 55 g
To find the heat of neutralization, we calculate:
Q = m C ΔT
where m equals the mass of the solution = 55 g
C represents the specific heat capacity of the solution = 4.184
ΔT signifies the temperature change = 6.8 K = (6.8 - 273) C = -266.2
The enthalpy of neutralization per mole of
=
Answer:
La masa molar del compuesto es: 168.82 g/mol
La masa molar del gas es: 16.38 g/mol
Explanation:
(a)
Utilizando la ecuación de gases ideales:
donde,
P es la presión
V es el volumen
n es el número de moles
T es la temperatura
R es la constante de los gases, cuyo valor es = 0.0821 L.atm/K.mol
Además,
Moles = masa (m) / Masa molar (M)
La densidad (d) = Masa (m) / Volumen (V)
Así, la ecuación de gases ideales se puede expresar como:
Dado que:-
Presión = 20 kPa = 20000 Pa
La expresión para la conversión de presión en Pascal a presión en atm se muestra a continuación:
P (Pa) = P (atm)
20000 Pa = atm
Presión = 0.1974 atm
Temperatura = 330 K
d = 1.23 kg/m³ = 1.23 g/L
Masa molar =?
Aplica la fórmula:
0.1974 atm × M = 1.23 g/L × 0.0821 L.atm/K.mol × 330 K
⇒M = 168.82 g/mol
La masa molar del compuesto es: 168.82 g/mol
(b)
Dado que:
Presión = 152 Torr
Temperatura = 298 K
Volumen = 250 cm³ = 0.25 L
Utilizando la ecuación de gases ideales:
R =
Aplicando la fórmula:
152 Torr × 0.25 L = n × 62.3637 L.torr/K.mol × 298 K
⇒n = 0.002045 moles
Dado que:
Masa del gas = 33.5 mg = 0.0335 g
Masa molar =?
La fórmula para calcular los moles se muestra a continuación:
Así,
La masa molar del gas es: 16.38 g/mol