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➷ The elements atomic number would be 91. The atomic number is simply the number of protons.
Extra info: The atomic mass would be the total of the number of protons and neutrons.
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Respuesta:
1.50 moles
Explicación:
Paso 1: Escribir la ecuación química ajustada para la descomposición del carbonato de calcio
CaCO₃ ⇒ CaO + CO₂
Paso 2: Calcular los moles correspondientes a 150 g de CaCO₃
La masa molar de CaCO₃ es 100.09 g/mol.
150 g × 1 mol/100.09 g = 1.50 mol
Paso 3: Calcular los moles de CO₂ producidos a partir de 1.50 moles de CaCO₃
La relación molar de CaCO₃ a CO₂ es 1:1.
1.50 mol CaCO₃ × 1 mol CO₂/1 mol CaCO₃ = 1.50 mol CO₂
Answer:
HCN(aq) 4.9×10−10
Explanation:
There is a relationship between the strength of an acid (or base) and the strength of its conjugate base (or conjugate acid):
The stronger the acid, the weaker its conjugate base. The weaker the acid, the stronger its conjugate base. The stronger the base, the weaker its conjugate acid.
So in short, we are to find the weakest acid amongst the options given. What is the relationship between acid ionization constant and its strength?
The larger the Ka, the stronger the acid and the higher the H+ concentration at equilibrium.
From this, the acid with the lowest Ka value is our acid of interest,
Upon observing the options, our answer is HCN, with a dissociation constant of 4.9×10−10
Answer:
- 3706.5 J.
Explanation:
The heat lost by the copper can be calculated using the formula:
Q = m.C.ΔT, where,
Q is the amount of heat lost by the mercury,
m is the mass of the copper <em>(m = 75.0 g)</em>,
C is the specific heat of Hg <em>(C = 0.140 J/g.°C)</em>,
ΔT is the temperature difference (the final temperature - the initial temperature<em> (ΔT = (297 K - 273) °C - (650 K - 273) °C = - 353 °C)</em>.
∴ The amount of heat lost by the mercury Q = m.C.ΔT = (75.0 g) (0.140 J/g.°C) (- 353 °C) = - 3706.5 J.
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