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Digiron [165]
3 years ago
9

Which substance absorbs 58.16 kJ of energy when 3.11 mol vaporizes? a)CH4 b)H2S c)CO2 d)NaCl

Chemistry
1 answer:
schepotkina [342]3 years ago
8 0

Answer:

H_2S

Explanation:

Given the amount of heat absorbed and the amount of substance in moles, we may calculate the heat of vaporization. Heat of vaporization is defined as the amount of heat per 1 mole of substance required to evaporate that specific substance.

Based on the value of heat of vaporization, we will identify the substance. Firstly, let's calculate the heat of vaporization:

\Delta H^o = \frac{58.16 kJ}{3.11 mol} = 18.7 kJ/mol

Secondly, let's use any table for heat of vaporization values for substances. We identify that the heat of vaporization of H_2S is 18.7 kJ/mol

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Answer:

Part A. 10 atm

Part B. C₆H₆

Explanation:

<em>Part A. At present, automobile batteries are sealed. When lead storage batteries discharge, they produce hydrogen. Suppose the void volume in the battery is 100 mL at 1 atm of pressure and 25°C. What would be the pressure increase if 8 × 10⁻² g H₂ were produced by the discharge of the battery?</em>

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We can find the pressure for this amount of Hydrogen using the ideal gas equation.

P.V=n.R.T\\P.V=\frac{m}{M} .R.T\\P=\frac{m.R.T}{M.V} =\frac{8 \times 10^{-2}g \times (0.082atm.L/mol.K) \times 298K  }{(2g/mol) \times 0.1L} =10atm

<em>Part B. A certain compound containing only carbon and hydrogen was found to have a vapor density of 2.550 g/L at 100°C and 760 mmHg. If the empirical formula of this compound is CH, what is the molecular formula of this compound?</em>

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First, we have to look for the molar mass of the compound through the following expression:

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\frac{78.1g/mol}{13.0g/mol} =6.01 \approx 6

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(CH) × 6 = C₆H₆

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