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PSYCHO15rus [73]
3 years ago
15

The fluorocarbon compound C2Cl3F3 has a normal boiling pointof

Chemistry
1 answer:
Dennis_Churaev [7]3 years ago
4 0

Answer:

5.21 kJ

Explanation:

The transformation happens in steps. First, the liquid solution gains heat (Q1) and has its temperature elevated from 5.00°C to 47.6°C. Then, it vaporizes at a constant temperature, with the heat of vaporization (Q2). After that, the substance gains heat (Q3) and the temperature increases to 82.00°C.

The heat of the transformation with the change in temperature can be calculated by:

Q = m*c*ΔT, where m is the mass, c is the specific heat and ΔT the temperature variation.

The heat of the phase change is the heat of vaporization multiplied by the number of moles of the substance.

The total heat required is the sum of the heats of the steps. The molar mass of C2Cl3F3 is 187.4 g/mol. The number of moles is the mass divided by the molar mass:

n = 25/187.4 = 0.1334 mol

So,

Q1 = 25.0 g * 0.91 J/g.K * (47.6 - 5.00)K = 969.15 J

Q2 = 0.1334 mol * 27.49 kJ/mol = 3.6672 kJ = 3667.2 J

Q3 = 25.0 g * 0.67 J/g.K * (82.00 - 47.6)K = 576.2 J

Q = 969.15 + 3667.2 + 576.2

Q = 5212.55 J

Q = 5.21 kJ

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Answer:

2.04 x 10²⁴ molecules

Explanation:

Given parameters:

Mass of Be(OH)₂ = 145.5g

To calculate the number of molecules in this mass of Be(OH)₂ we follow the following steps:

>> Calculate the number of moles first using the formula below:

Number of moles = mass/molarmass

Since we have been given the mass, let us derive the molar mass of Be(OH)₂

Atomic mass of Be = 9g

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Number of moles = 145.5/43 = 3.38mol

>>> We know that a mole is the amount of substance that contains Avogadro’s number of particles. The particles can be atoms, molecules, particles etc. Therefore we use the expression below to determine the number of molecules in 3.38mol of Be(OH)₂:

Number of

molecules= number of moles x 6.02 x 10²³

Number of molecules= 3.38 x 6.02 x 10²³

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3 years ago
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